05000321/LER-1981-112-01, /01T-0:on 811009,during steady-state Power, Discovered Torus to Reactor Containment Bldg Differential Pressure Switches & Static O-ring Had Proof Pressures of 10 & 20 Psig.Caused by Switch Misapplication

/01T-0:on 811009,during steady-state Power, Discovered Torus to Reactor Containment Bldg Differential Pressure Switches & Static O-ring Had Proof Pressures of 10 & 20 Psig.Caused by Switch Misapplication

ML20011B018
Person / Time
Site:	Hatch
Issue date:	10/20/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20011B013	List: 05000321/LER-1981-112, Forwards LER 81-112/01T-0 05000321/LER-1981-112-01, /01T-0:on 811009,during steady-state Power, Discovered Torus to Reactor Containment Bldg Differential Pressure Switches & Static O-ring Had Proof Pressures of 10 & 20 Psig.Caused by Switch Misapplication
References
LER-81-112-01T, LER-81-112-1T, NUDOCS 8111030536
Download: ML20011B018 (2)

LER-1981-112, /01T-0:on 811009,during steady-state Power, Discovered Torus to Reactor Containment Bldg Differential Pressure Switches & Static O-ring Had Proof Pressures of 10 & 20 Psig.Caused by Switch Misapplication

Event date:
Report date:
3211981112R01 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVEN f REPORT CONTROL BLOCK:

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PRC.ABLE CONSEQUENCES h 10121 l During steady state power operation the site discovered the HNP-1 & 2 J g ;3, i torus-to-rx. bldg. d.p.

sw.,

1T48-N210, N211, 2T48-N210 and N211 respecti-go g,;ively, had proof press. of 10 & 20 PSIG respectively. This results in I

g o,si g inoperability of the sw. (T.S. 3.7.A.3 (HNP-1) and 3.6.4.2 (HNP22)) and l l O l6 l la Potential loss of prim. cont. integrity (3.7.8.2 (HNP-1) and 3.'6.1.1 l

l0 l 7 l l (HNP-2). Neither plant operation nor the health or safety of the public l

,o giiwas affected. This is a non-repetitive event.

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33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g lThe cause of this event has been attributed to mis-application of sw.

I g i uring initial design. The HNP-2 DP sw. were replaced with Barton sw.

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, ;which have acceptable proof press.

The HNP-1 DP sw. were replaced with l

a single Barton sw. The unit was S/D prior to expiration of the 7 day l

LCO for the fuel recon. outage. Both HNP-1 DP sw. will be replaced.

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LER #:

50-321/1981-112 Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-112 On October 9,

1981, while the plant was in-steady state operation, the site discovered the HNP-1 and 2 Torus-to-Rx, Bldg.

diff.

press.

switches l'l48-N210 and N211 made by Barksdale _ and 2T48-N210 and N211 made by static o-ring had

- proof pressures of 10 psig and 20 psig respectively.

This results in technical inop(erability of the switches which is required per Tech Specs HNP-1) 3.7.A.3 and (HNP-2) 3.6.4.2 and a potential loss of. primary containment integrity which is required per Tech Specs (HNP-1) 3.7.8.2 and (HNP-2) 3.6.1.1.

Neither plant operation nor the health-or safety of the public was affected.

This is a non-repetitive event.

The cause of this event has been attributed to mis-application of switches due-to oversight in initial design.

The HNP_2 diff. press, switches were replaced with Barton switches that have an acceptabic proof pressure.

The HNP-1 diff.

press.

switches were removed and replaced with a

single Barton switch.

The unit was shutdown prior to expiration of the 7

~ day LCO for the scheduled fuel reconstitution outage.

Both HNP-1 diff. press. switches will be replaced prior to startup.

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