ML20099K155

Application to Amend License DPR-35,changing Tech Specs to Modify Rod Block Monitor/Rod Block Setpoint During Single Loop Operation

ML20099K155
Person / Time
Site:	Pilgrim, 05000000
Issue date:	03/01/1976
From:	Howard J BOSTON EDISON CO.
To:	Ziemann D Office of Nuclear Reactor Regulation
Shared Package
ML20099K024	List: ML20099K053 ML20099K111 ML20099K116 ML20099K155 ML20099K172 ML20099K232 ML20099K268 ML20099K308 ML20099K324 ML20099K349 ML20099K371 ML20099K494 ML20099K508 ML20099K512 ML20099K542 ML20099K556 ML20099K559
References
FOIA-84-105 76-4, NUDOCS 8411290336
Download: ML20099K155 (2)

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. March 1, 1976 BECo. Ler. #76-4 i-Director of Nuclear Reactor Regulation ATTN: D. L. Ziemann, Chief Operating Reactors Branch #2 ,.

Division of Reactor Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Docket No. 50-293 - License No. DPR-35 RBM Setpoint During Single Loop Operation

Dear Sir:

Cu November 17,1975, 3oston Edison submitted analyses in support of Pilgrim I operation with a single recirculation pump *in service. As indicated in our November 17 letter, the equation for the RBM rod block setpoint must be modified to provide additional local core protection from the postulated rod withdrawal error while on single Icop operation. The testing *we

i. indicated would be performed the next time Pilgrim I was on single loop l operation has been perfor=ed and appropriate Technical Specification i

revisions to Technical Specification Page 34 are hereby proposed. In addition, changes to the APRM scram and rod block setpoints while on single loop operation are also proposed as indicated on the attached proposed Technical Specification Pages 27 and 54. These proposed revisions are submitted as a supple =ent to our July 9, 1975 and November 17, 1975 ECCS/GETAB sub=ittals in response to your letter of June 13, 1975.

The testing perfor=ed to deter =ine the appropriate RBM rod block setpoint equation for single loop operating showed that this equation did not exactly parallel the two pump curve as inferred in NEDO-20999. However, since the data falls in a conservative direction with respect to this setpoint, an appropriate setpoint has been administrative 1y imposed in the interim until the NRC issues the proposed revisions. As shown on the attached page, the proposed 4Mocn m.,_-z JdtM' for single loop operation is N This is consistent with the slope and intercept for the RBM rod block setpoint for two pu=p operation as proposed in our July 9, 1975

, letter. However, in the interim until these proposed Technical Specification revisions are issued, a setpoint of M will be administratively imposed. Similar restrictions will be placed on the APRM scram and rod block ,

setpoints. This setpoint is consistent with the present Pilgrim I RMB setpoint equation for two pump operation. A summary of the RBM Rod Block Setpoint History is attached in Table 1.

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[ Director of Nuclear Reactor Regulation L. . ATTN

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Page 2 Since the present Pilgrim I Technical Specifications allow operation with a single recirculation pump and these proposed Technical Specification revisions merely incorporate an additional operating restriction,.we believe that these Technical Specification revisions can be issued without endangering the >

health and safety of the public.

These proposed Technical Specification revisions have been approved by the ,

Operating Review Committee and reviewed by the Nuclear Safety Review and Audit Committee.

If you have additional questions regarding this subject, please contact us.

Very truly yours, s

- W.4# { <., ~ Y?v'f' .

Cc==onwealth of Massachusetts)

County of Suffolk )

Then personally appeared before =e J. Edward Howard, who, being duly sworn, did state that he is Vice President - Nuclear of Boston Edison Ceepany, the Applicant herein, and that he is duly authorized to execute and file the submittal contained herein in the name and on behalf of Boston Edison Cocpany and that the state =ents in said submittal are true to the best of his knowledge and belief.

r My Cocmission expires: # 4 s Nota (y Public WILLI.1 H. CO.*;ELLY, flotary Pme My canm ssu Up:es Ten, t, nn s

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