05000321/LER-1981-088-03, /03L-0:on 810811 & 18,oil Leaks Discovered on HPCI Oil Sys.Caused by Ruptured Diaphragm on Diaphragm Control Valve.Diaphragm Replaced

/03L-0:on 810811 & 18,oil Leaks Discovered on HPCI Oil Sys.Caused by Ruptured Diaphragm on Diaphragm Control Valve.Diaphragm Replaced

ML20010G912
Person / Time
Site:	Hatch
Issue date:	09/09/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010G903	List: 05000321/LER-1981-088, Forwards LER 81-088/03L-0 05000321/LER-1981-088-03, /03L-0:on 810811 & 18,oil Leaks Discovered on HPCI Oil Sys.Caused by Ruptured Diaphragm on Diaphragm Control Valve.Diaphragm Replaced
References
LER-81-088-03L, LER-81-88-3L, NUDOCS 8109220654
Download: ML20010G912 (3)

LER-1981-088, /03L-0:on 810811 & 18,oil Leaks Discovered on HPCI Oil Sys.Caused by Ruptured Diaphragm on Diaphragm Control Valve.Diaphragm Replaced

Event date:
Report date:
3211981088R03 - NRC Website

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NRC FORM 36G U.S. NUCLEAR REGULATORY COMMISSION (777)

LICENSEF EVENT REPORT CONTROL BLOCK: l l

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8 60 63 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DAT E 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h 10 # 21 pn 8-11-81, with Hatch 1 pcrforming Rx. S/U and on 8-18-81. with the uniti iO i3i iat steady state 91.77. thermal power oil le'aks were discovered on the HPCII iai.,i pil system.

This is reportable under Tech Spec 6.9.1.9.b. As per Tech 1

10 i s t fPec 3. 5.D RCIC, ADS, CSS, and LPCI were operable and no significant l

l0 lei pvents occurred.

This is a non-repetitive event and there were no l

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31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h Ii 10 l 1 These oil leaks were due to a rut >tured diaphraem on the Robt. Shaw Dia-1 Ii ii i I phragm Control Valve.

The diaphraem was reolaced each time with ones I

,,i,iinot meeting original design specifications.

Close monitoring will con

'I i,,3i ltinue until Terry Turbine suoplies a diaphragm meeting original desinn I

tigiispecifications.

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50-321/1981-088 Licensee:

Georgia Power Company-Facility-Name:

Edwin I. Hatch 4

Docket #:

50-321

Narrative

Report for LER 50-321/1981-088 On 12 - 81, the Unit 1 HPCI, Robert Shaw diaphragm control valve (Model VC-210) supplied by General

Electric, was installed to solve a. previous HPCI inoperability problem (Ref:

LER 50-321/1981-068).

It was unknown at the time that the diaphragm supplied with the valve was made - of a material not meeting original design spec.

The new valve along with its diaphragm was installed and HPCI was proven operable following this event.

On 7-21'-81, with Unit 1 at steady state 95.7% thermal power, procedure HNP-1-6011 "HPCI Leakage Inspection" was being-performed.

During this insp ect i.on, the ' diaphragm in the HPCI Robert Shaw diaphragm control valve.

ruptured and

'the inspection was stopped.

HPCI was declared inoperabic per Tech Spec 3.5.D.2 and RCIC,

ADS, CSS, and LPCI were operable.

There were no effects upon public health and safety due to this event.

Upon inspection of the diaphragm, it was observed that the diaphragm was deformed, thereby leading plant personnel to believe the wrong size diaphragm rather than a

non-coil compatable diaphragm was installed in the G.E.

Supplied, Robert Shaw diaphragm control valve.

A replacement diaphragm t

was obtained through Robert Shaw for the model VC-210 Control Valve, and it was unknown at the time that the diaphragm.was non-oil compatable and therefore had a reduced lifetime.

The diaphragm was installed and HPCI was proven operable.

On 8-11-81, with Unit 1 in Rx startup at 0% thermal power, the operators noticed that the "HPCI Oil Tank - Level High/ Low" annunciator was activated and 'upon investigation, it was discovered that the HPCI oil tank was emptied due to

'a ruptured diaphragm in the Robert Shaw diaphragm control valve.

The LPCI system was declared inoperable per Tech Spec section 3.5.D, RCIC, ADS, CSS, and LPCI were operable.

No significant event occurred.

~ Upon examination of the diaphragm, it was found to be in the same deformed shape as the one previously removed.

It was then realized that the diaphragns obtained from Robert Shaw were non-oil compatable.

An attempt to obtain an oil compatable diaphragm f rom G.E.

and Terry Turbine was made~but proved unsuccessful due to the unavailability of a replacement diaphragms capable of meeting original design specifications.

Site personnel felt that using the Robert Shaw diaphragms with the reduce.d lifetime could be used if the diaphragm was replaced on a bi-weekly basis, until replacement diaphragm capable of meeting the original design spec. was available.

The diaphragm was replaced and HPCI was proven operabic.

On 8-18-81, at 9:45 EDT and with Unit 1 at steady state 91.7%

thermal power, the monthly test of "HPCI Pump Operability" (HNP-1-3303) was being performed.

As per procedure "HPCI Leakage Inspection" (HNP-1-6011) it was found that the Robert Shaw diaphragm in the Robert Shaw Control Valve had ruptured.

The HPCI system was declared inoperable and per Tech Spec Section 3.5.D.2 RCIC, ADS, CSS, and LPCI were operable.

No significant event occurred.

The diaphragm for the control valve was replaced with a Terry Turbine Supplied diaphragm different from the one previously installed, but capable of 100 cycles.

Close monitoring of the number of cycles placed on the diaphragm is in progress until a replacement meeting the 1000 cycle condition is availabic.

This is a non-repetitive event and there were no ef fects upon public health and safety due to this event.

There is no impact on Unit 2 HPCI since it has the 1000 cycle diaphragm installed.

This is currently being evaluated as a potential 10CFR21.

The 1000 cycle diaphragm will be installed in Unit 1 HPCI following receipt.

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