ML20024G071
| ML20024G071 | |
| Person / Time | |
|---|---|
| Site: | Monticello  |
| Issue date: | 10/04/1976 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Mayer L NORTHERN STATES POWER CO. |
| References | |
| NUDOCS 9102070505 | |
| Download: ML20024G071 (4) | |
Text
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DISTRIBUTION j
n' Docket NRC PDR f
Local PDR I
ORB #2 Reading 10 Docket No. 50-263 er 2
DLZiemann 00T 0 4 1976 RMDiggs(2)
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Northern States Power Company RPSnaider ATTW: Mr. L. O. Mayer, Manager PW0'Connor Nuclear Support Services JGuibert 414 Nicollet Hall - 8th Floor OELD - Stewis/Riddige Minneapolis, Minnesota 55401 Ol&E(3)
DEisnehut Gentlemer.:
TBAbennathy l
i JRBuchanan J
I RE: HONTICELLO HUCLEAR GENERATING PLANT ACRS(16) l In accordance with the requirements of the Mark I Containment Evaluation Short Term Program (STP), you have recently submitted a Plant Unique Analysis (PUA) of the effects of potential post-LOCA hydrodynamic loads on the suppression chamber (torus) support system and on the piping i
attached to the torus for your Mark I BWR f acility. The hydrodynamic loads which were considered in your POA had been adjusted to reflect l
certain assumed initial conditions for operation of your facility; l
1.e: operation with a specified differential pressure between the dry-well and the torus, and operation near the ninimum torus water level allowed by Technical Specifications.
Both of these assumptions result in a reduction in post-LOCA hydrodynamic loads on the Mark I Contain-ment structures. Consequently, in order to assure that the PUA results may be conservatively applied to the STP evaluation of your facility's primary containment, the NRC staff has detemined that the above-1 nentioned assumptions utilized in your PUA must be reflected in the Technical Specifications for your facility.
i Vith respect to drywell-torus differential pressure control assumed l
in your PUA, we request that you submit an application for license anendnent to incorporate the requirements of the enclosed nodel technical j
speci fica tions. Your application should include the following support-ing information:
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.l A description of the methods used to establish and maintain a.
drywell-torus differential pressure at your facility.
j b.
A description of any system changes or valve lineup channes which are required to implement drywell-torus differential pressure control.
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I oeric E
- DATE &
Form Af C-318 ( Rev. 9-3 3) AECM 0240
- u. e.. ova nhu s NT PRtNitNG OP PICER 1974..a. l..
9102070505 761004 ADOCKOSOOg3 DR
e er Northern States Power Company :
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A descriptiun of the instrumentation which you will utilize
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to monitor the drywell-torus differential pressure. This i
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description should include (1) the range and accuracy of I
the instrissentation (2) the number of instrument channels available (3) the location of instrument channel readouts, j
and (4) the Technical Specification requirements dich t
currently exist for the instrumentation.
If Technical Specification requirements do not currently exist for this instrumentation, your appitcation for license amendment should include proposed changes to incorporate appropriate Lietting, c
Conditions for Operation and Surveillance Requirements.
l With respect to the effects of variations in the torus water level on the PUA results for your facility, if you detemine that the PUA results are i
not applicable for the range of torus water levels currently allowed by your Technical Specifications, you nust either provide supplemental infomation which demonstrates that the PUA structural acceptance criteria are met for the currently specified range of torus water levels or submit an application i
for license anendment to change your Technical Specification limits for torus water level to a range over Wich the PUA structurel acceptance criteria are met.
In either case we request that you provide a description of the I
torus water level instrumentation at your facility. This description should include (1) the range and accuracy of the instrumentation, (2) the number of instrument channels available, (3) the location of instrument channel readouts, and (4) the Technical Specification requirements which currently exist for the instrumentation.
If Technical Specification requirements do not currently exist for this instrumentation, your application for license amendment should include proposed changes to incorporate appropriate Limiting Conditions for Operation and Surveillance Requirements.
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We require that the above-mentioned application for license amendment and I
supporting information be submitted within 30 days of receipt of this letter.
Three signed originals and 40 copies of your response will be required.
This request for generic infomation was approved by CAO under a blanket clearance number B-180225 (R0072); this clearance expires July 31, 1977.
Sincerely, Oric1nal sTc~na 'm
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Dennis L. Men.,
Dennis L. Itemann, Chief Operating Peactors Branch #2 Division of Operating Reactors
Enclosure:
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l Form AEC.$la (Rev. 9 53) ABCM 0240 W u. e. oovannusnt enintine orricas i.74.sa e..
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Northern States Power Company
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OCT ni 1:yg cc w/ enclosure:
Gerald Charnoff, Esquire Shaw, Pittman, Potts and Trowbridge 1800 M Street, N. W.
Washington, D. C.
20036 Arthur Renquist, Esquire Vice President - Law Northern States Power Company 414 Nicollet Mall Minneapolis, Minnesota 55401 Howard J. Vogel, Esquire Legal Counsel 2750 Dean Parkway Minneapolis, Minnesota 55416 Mr. Steve J. Gadler 2120 Carter Avenue St. Paul, Minnesota 55108 Mr. Kenneth Dzugan Environmental Planning Consultant Office of City Planner Grace Building 421 Wabasha Street St. Paul, Minnesota 55102 Sandra S. Gardebring, Esquire Special Assistant Attorney General Minnesota Pollution Control Agency 1935 W. County Road B2 Roseville, Minnesota 55113 Anthony Z. Roisman, Esquire
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Roisman, Kessler and Cashdan 1025 15th Street, N.
W., 5th Floor Washington, D. C.
20005 The Environmental Conservation Library Minneapolis Public Library 300 Nicollet Mall Minneapolis, Minnesota 55401 l
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LIMITING CONDITIONS FOR OPERATION SURVEILLANCE REQUIREENTS f
3.7 CONTAINHENT SYSTEMS 4.7 CONTAINNENT SYSTEMS Drywell-Suppression Chamber Drywell-Suppression Chamber
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Differential Pressure J, i<
Differentip1 Pressure
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3 a.
Differential pressure a.
The pressure differ-between the drywell and ential between the i
supprescion chamber shall drywell and suppression 5
be maintained at equal chamber, shall be recorded te or graater than leXX at least once each shift.
psid e.caept as specified in (1) and (2) below:
(1) This dif ferential shall bt.estab-11shed within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of achieving operating temperature and pressure.
(2) This cifferential may be decreased to less than 1.XX psid for a maximum of two hours during required operability testing of the HPCI system pisnp, the RCIC system pump, and the drywell-pressure suppression chamber vacuum breakers.
b.
If the differential pressure of specifica-tion 3.7.a cannot be maintained, an orderly shutdown shall be initiated and the reactor shall be in the Hot Shutdown condition within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and the Cold Shutdown condition within the following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
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Forse AEC,313 (Rev. 9.S$) AECM 0240 W u. e, novsmausar paravene orric s' s***.ese. tee
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