ML20040B497

Interim Deficiency Rept Re Induced Neutron Flux Error, Originally Reported on 801113.B&W Will Decide in Jan 1982 Between Hardware Mod as Alternate Measurement of Core Power & New Analyses Confirming Acceptability of Present Design

ML20040B497
Person / Time
Site:	Washington Public Power Supply System
Issue date:	12/28/1981
From:	Mazur D WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Faulkenberry R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, GO-1-81-431, NUDOCS 8201260116
Download: ML20040B497 (2)

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Dockeb Nos. 50 l+60/513

,Y vd 50.55(e) Report phE![ED I

Washington Public Power Supply System P.O. Box 968 3000 GeorgeWashington Way Richland, Washington 99352 (509J3g5 b !): 3'.;

December 28, 1981 GO-1-81-431 NOlG;; r,;

i Nuclear Regulatory Commission

[k.N' i

Region V i

1450 Maria Lane, Suite 210 N

Walnut Creek, California 94596 Attention:

Mr. R. H. Faulkenberry c

.P9 3 ~ EO Chief, Reactor Construction

'7 Projects Branch

., ' ~

Subject:

SUPPLY SYSTEM NUCLEAR PROJECTS NOS. 1 AND 4 j

DOCKET NOS. 50-460 AND 50-513 K,f' REPORTABLE CONDITION 10CFR50.55(e) j INDUCED NEUTRON FLUX ERROR - INTERIM REPORT l

Reference:

1)

Telecon, TJ Houchins, Supply System to DF Kirsch, Region V Nuclear Regulatory Commission l

dated November 13, 1980 1

2)

Letter, DW Mazur, Supply System to RH Engelken, NRC, same subject, dated December 12, 1980 j

3)

Letter, DW Mazur, Supply System to FH Faulkenberry, NRC, Same Sabject, dated July 28, 1981.

In reference (2) the Supply System reported the existence of a reportable condition (10CFR50.55(e)) to the NRC. The concern related to errors in the measurement of core neutron flux during certain postulated acci-dents. In reference (3) we provided an interim report on this item.

The status of the resolution of this concern to date is as follows:

Status There are two potential resolutions to this concern.

They are: (1) l a hardware change providing an alternate measurement of core power, i

and (2) new analyses confirming the acceptability of the present design.

In Dece7,oer, Babcock & Wilcox completed their initial evaluations of the feasibility of both of these potential resolutions.

It appears that either method is feasible. Babcock & Wilcox is to make their i

formal recommendation as to the desired resolution in January 1982.

i (En 8201260116 811228 PDR ADOCK 05000460

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R. H. Faulkenberry Interim Report Page Two We expect to provide your office with a report describing the resolution of this concern by March 3, 1982.

N' D. W. Mazur Prigram Director WhP-1/4 CRE:MER:lm cc: CR Bryant, BPA/399 V. Mani, UE&C/897 RR Steinke, B&W