| 0 , Northern States Power Company ~ 9 e J_ 414 Nicollet Mall D. E. Gilberts Minneapohs. Minnesota 55401 senior vice President lelephone (612) 330-6071 Power Supply January 22. 1981 . Mr. James G. Keppler Director, Region III Office of Inspection and Er.forcement U. S. Nuclear Regulatory Commission 799 Roosevelt Road ,, g ) 4 % / D Glen Ellyn, IL 60137 Ny .-n s ' i Dear Mr. Keppler: Gk. #'?>' Y.' f; V~ pqG N PRAIRIE ISLAND NUCLEAR GENERATING PLAhT | II~ gj Docket Nos. 50-282 and 50-306 References: S 1. NSP Letter to Mr. J. G. Keppler, NRC Region III, October 31, 19 - / * |. # 2. NRC Office of Inspection and Enforcement; IE Supplement No. 3 to Bulletin No. 79-OlB, October 24, 1980 3. NSP Letter to Director of Nuclear Reactor Regulation on January 1, 1980 Lessons Learned Implementation, March 13, 1980 IE Supplement No. 3 to Bulletin No. 79-OlB required submit'.al of qualification information for equipment resulting from TMI Action Plan requirements and equipment which is required to achieve cold shutdown. Qualification Information for Installed TMI Action Plan Equipment Safety grade subcooling margin monitors have been installed in Unit 1 and 2. The temperature input is derived from multiple core exit thermocouples and the pressure input is derived from Reactor Coolant System (RCS) wide range pressure. Outstanding items concerning qualification of the temperature and pressure inputs have been previously addressed in Reference 1. Until the inputs to the subcooling monitors have been upgraded, the P-250 plant computer has been programmed to accept the best available temperature and pressure inputs; see Reference 3. Qualification relating to components not previously addressed is reported in Attachment A of this response. Qualification information for future TMI Action Plan equipment will be sub- mitted by the pre-implementation or implementation review date as required DOj by Reference 2, Supplement 3 to Bulletin 79-OlB. # # / Equipment Required to Achieve Cold Shutdown The November 1, 1980 response to Bulletin 79-OlB has been reviewed to identify additional electrical equipment necessary to achieve and maintain a Cold Shutdown condition. I 8204070472 810122 ! PDR ADOCK 05000282 JAN 2 61981 * PDR I
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| 0,
Northern States Power Company~9
e J_ 414 Nicollet Mall D. E. GilbertsMinneapohs. Minnesota 55401 senior vice Presidentlelephone (612) 330-6071 Power Supply
January 22. 1981.
Mr. James G. KepplerDirector, Region IIIOffice of Inspection and Er.forcementU. S. Nuclear Regulatory Commission799 Roosevelt Road ,, g ) 4 % /
DGlen Ellyn, IL 60137 Ny.-n s' iDear Mr. Keppler:
Gk. #'?>' Y.'f; V~
pqG NPRAIRIE ISLAND NUCLEAR GENERATING PLAhT | II~
gjDocket Nos. 50-282 and 50-306
References: S
1. NSP Letter to Mr. J. G. Keppler, NRC Region III, October 31, 19 - / * |. #2. NRC Office of Inspection and Enforcement; IE Supplement No. 3 to
Bulletin No. 79-OlB, October 24, 19803. NSP Letter to Director of Nuclear Reactor Regulation on January 1, 1980
Lessons Learned Implementation, March 13, 1980
IE Supplement No. 3 to Bulletin No. 79-OlB required submit'.al of qualificationinformation for equipment resulting from TMI Action Plan requirements andequipment which is required to achieve cold shutdown.
Qualification Information for Installed TMI Action Plan Equipment
Safety grade subcooling margin monitors have been installed in Unit 1 and 2.
The temperature input is derived from multiple core exit thermocouples andthe pressure input is derived from Reactor Coolant System (RCS) wide rangepressure. Outstanding items concerning qualification of the temperature andpressure inputs have been previously addressed in Reference 1.
Until the inputs to the subcooling monitors have been upgraded, the P-250plant computer has been programmed to accept the best available temperatureand pressure inputs; see Reference 3. Qualification relating to componentsnot previously addressed is reported in Attachment A of this response.
Qualification information for future TMI Action Plan equipment will be sub-mitted by the pre-implementation or implementation review date as required DOjby Reference 2, Supplement 3 to Bulletin 79-OlB. #
# /Equipment Required to Achieve Cold Shutdown
The November 1, 1980 response to Bulletin 79-OlB has been reviewed to identifyadditional electrical equipment necessary to achieve and maintain a ColdShutdown condition.
I8204070472 810122 !PDR ADOCK 05000282 JAN 2 61981* PDR
I
e
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Mr. James G. Kepplero
Page 2January 22, 1981
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The residual heat removal system, while not necessary, would, if available,normally be used to cool the plant to cold shutdown. Additional electrical.
equipment normally used would be the nonsafeguarda RHR suction valves fromboth RCS hot 1 cgs and the nonsafeguards loop B RHR return valve. The environ-mental specification and qualification of these components is identified inAppendix A of this response. Outstanding items have been identified forspecific accident related environmental conditions. NSP intends to continueinvestigation of these outstanding items.
In the event that the residual heat removal system components identified for.cooldown are not available, the auxiliary feedwater system along with thesecondary side power-operated relief valves would be used to bring the plantto a safe cold shutdown condition. The safety injection pumps and residualheat removal pumps, taking suction from the refueling water storage tank orcontainment sump, would be used to maintain reactor coolant system inventory.Use of the steam generators as a forced cooling water heat exchanger at lowertemperatures is discussed in FSAR Section I.8.
Yours truly,
0D. E. GilbertsSenior Vice PresidentPower Supply
cc: Mr. G. CharnoffMr. C. D. FeierabendNRC Office of Inspection and Enforcement
Washington, D. C. 20555
Enclosures
DEG:nk
6
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UNITED STATES NUCLEAR REGULATORY COMMISSION
NORT11ERN STATES POWER COMPANY -
PRAIRIE ISLAND NUCLEAR GENERATING PLANT
Docket No. 50-282 and 50-306
LETTER DATED JANUARY 22, 1981RESPONDING TO NRC REQUEST
FOR INFORMATION IN IE BULLETIN 79-01B
Northern States Power Company, a Minnesota corporation, by this letter datedJanuary 22, 1981, hereby submits information in response to NRC request forinformation concerning IE Bulletin no. 79-01B.
This request contains no restricted or other defense information.
NORTHERN STATES POWER COMPANY
By h, W-
L 0 MayptManager of Nuclear Support Services
On this MM day of & m m /98[,beforemeanotarypublicinand,
for said County, personallyvappearedfL 0 Mayer, Manager of Nuclear Support Services,and being first duly sworn acknowledged that he is authorized to execute thisdocument on behalf of Northern States Power Company, that he knows the contentsthereof and that to the best of his knowledge, information and belief, the statementsmade in it are true and that it is not interposed for delay,
O~aru
.::..:: :.: :.::::.:7...
ffe% BETTY J. DEAN o-
Notanv evotic . uiNNtsotA ::? RAMSEY COUNTY !{.: . :. ^^ ^, u Commism Empes Dec to 1987 |; , r
2) Design Review of Plant Sheilding and Environmental 2) Reference attached letter, this response.Qualification of Equipment for Spaces / Systems outside 3) Only when a llELB occurs.Containment which may be used in Post. Accident 4) Only when a LOCA occurs.Operations - Part I; July 1,1980.