ML20206F074

Final Deficiency Rept (CDR 86-00-03) Re Potential Malfunction of P-10 Permissive.Initially Reported on 860324. Verification That P-10 Permissive Properly Changes State Will Be Made by Observing Bistable Status Lights

ML20206F074
Person / Time
Site:	Seabrook
Issue date:	06/06/1986
From:	Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(CDR-86--3, (CDR-86--3), (CDR-86-00-03), SBN-1095, NUDOCS 8606240122
Download: ML20206F074 (4)

Text

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• , SEABROOK STATION Engineering Office g June 6, 1986 NEW HAMPSHIRE YANKEE DIVISION SBN- 1095 T.F. Q2.2.2 United States Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406 Attention: Mr. Richard W. Starostecki, Director Division of Project and Resident Programs

References:

(a) Construction Permits CPPR-135 and CPPR-136, Docket No.s 50-443 and 50-444 (b) Westinghouse Letter, NS-NRC-86-3108, dated February 27, 1986, E. P. Rahe (W) to J. M.

Taylor (NRC)

(c) Telecon of March 24, 1986, W. H. Reed (YAEC) and P. Christofakis (YAEC) to K. Gibson (Region I)

(d) PSNH Letter (SBN-1037), dated May 7,1986,

" Interim 10CFR50.55(e) Report: Potential Mal-function of P-10 Permissive", J. DeVincentis to R. W. Starostecki Subj ect : Final 10CFR50.55(e) Report: Potential Malfunction of P-10 Permissive (CDR 86-00-03)

Dear Sir:

In Reference (c), we reported a 10CFR50.55(e) deficiency regarding possible malfunction of the P-10 Permissive. As discussed in Reference (d), under certain circumstances and assumptions, it is possible that the P-10 permissive would not reset itself automatically when the power level is reduced below the P-10 setpoint. As a consequence, this would prevent the reactor from tripping when necessary.

8606240122 860606 3 DR ADOCK 0500 Seabrook Station Construction Field Office P.O. Box 700 . Seabrook, NH O3874 - I# A7 a

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l United States Nuclear Regulatory Commission Attention: Mr. Richard W. Starostecki Page 2 The Westinghouse recommended corrective actions [ Reference (b incorporated into the SeabrooK Station's Plant Abnormal Operating Procedures are as follows: a) When reducing power to below the P-10 setpoint, verification that the P-10 permissive properly changes state will be made by obser-vation of the existing control room bistable status lights, per-missive status lights, and associated alarms. These actions will be taken should a power range channel or portion thereof, affect-ing P-10, become inoperable. b) Reasonable attempts will be made to regain source range instru-mentation if source range (s) are inoperable. i As such, this is considered our final report on this item. Very truly yo rs, 4 John DeVincentis Director of Engineering cc: Atomic Safety and Licensing Board Service Lis t Director, Of fice of Inspection and Enforcement United States Nuclear Regulatory Commission Washington, DC 20555 l _ _ . . - I

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