ML20099K053
| ML20099K053 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim, 05000000 |
| Issue date: | 11/17/1975 |
| From: | Feldmann M BOSTON EDISON CO. |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20099K024 | List: |
| References | |
| FOIA-84-105 NUDOCS 8411290295 | |
| Download: ML20099K053 (2) | |
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EQSTON EDISQN COMPANY i
SQQ EoYbSTCN STRCeT aosToN. NASSACHUSCTTs OnI99 M. J. FELOMANN
.a November 17c 1975 Director of Nuclear Reactor Regulation i
ATTN:
D. L. Ziemann, Chief Operating Reactors Branch #2 i
Division of Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Coc: mission Washington, D. C.
20555 Docket No. 50-293 License No. DPR-35 Single Loop Operation Analyses
Dear Sir:
In an attachment to your June 18, 1975, letter to Mr. M. J. Feldmann of 3oston Edison Co=pany, you indicated that a proposal for partial loop operation should be supported by sufficient justification to allow opera-tion in this mode.
In a letter dated July 9, 1975,. Boston Edison indicated the Analysis for Partial Loop Operation was being conducted and would caat ba submitted when completed sad reviewed. This analysis has'now been completed and is hereby submitted in support of single loop operation, In order to maintain peak cladding temperatures at or below 2200 7 during a postulated LOCA while operating with a single recirculation loop, a steady state MAPLHGR limit somewhat lower than the two pump operating limit must be imposed while on single loop operation. The MAPLHGR reduct. ion factor for Pilgrim I has been conservatively calculated to be 0.867.
In addition, jet pump flow characteristics differ between ene anc two pump operation. Reverse flow through ten of the twenty jet pumps while in single loop operation requires that the equation for the RBM rod block setpoint be modified as indicated in Section 4.2 of NEDO-20999 to provide additional local core protection from the postulated rod withdrawal error. The next time the reactor is operated on single loop operation, testing will be per-farmed to determine the appropriate rod block setting equation, and an additional Technical Specification revision incorporating this limit will be proposed at that time. The limits determined from the testing will be administratively imposed until the future proposed revisions are issued.
In acccedance with the above statements, 3dston Edison hereby arands its j
s: bmittal of July 9,1975, by proposing the attached Technical Specification revisions to provide app opriate limits while on single recirculation loop oceration. These proposed changes effect Technical Specification Pages 205A and 205C, and add Pages 205M, 205N, 205(0), 205P, 205Q, 205R, and 205S.
3 A copy of NEDO-20999, the analyses in support of Pilgrim I operation on one recirculation loop, is attached.
1 8411290295 840419 PDR FOIA 1317'9 i
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D. L.-Ziemann, Chief j-Operating Reactors Branch #2 i
November 17, 1975
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j In the interim until these proposed Technical Specification revisions are 1
dssued, and since (1) the present Technical Specifications allow operation i'
-with a single recirculation loop, and j-(2) justification for single loop operation with the by-pass hole plugs has now been provided.
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. Boston Edison proposes to operate Pilgrim I on a single recirculation loop
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as the need arises and within the operational constraints defined herein.
A The more conservative of the MAPLHGR's proposed herein as Technical Specifica-r tions and.867 times the MAPLHGR's imposed by the NRC order of December 27, 1974 will be utilized as interim limits while on single loop operation until
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c'.te proposed Technical Specifications are issued.
If you have further questions on this subject, please contact us.
Very truly yours, epta (3 originals and 40 copies)
Cam =onwealth of Massachusetts)
County of Suffolk
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Jhen personally appeared before me M. J. Feldmann, who, being duly sworn, cid state that he is Senior Vice President - Nuclear of Boston Edison Campany, the applicant hetein, and that he is duly authorized to execute and file the submittal contained herein in the name and on behalf of 2aston Edison Company and that the statements in said submittal are true to the best of his knowledge and belief.
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