ML19308D354

RO-77-26:on 770322,makeup Valve Failed to Open on Manual Hpis Initiation,Contrary to Tech Spec Requirement.Caused by Torque Switch Set Too Low for Consistent Opening of Valve. Torque Switch Reset to Higher Valve

ML19308D354
Person / Time
Site:	Crystal River
Issue date:	04/12/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D348	List: ML19308D347 ML19308D354
References
NUDOCS 8002270810
Download: ML19308D354 (2)

Text

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CONTROL ULOCK

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LC[NSE EVENT e [CN)

• NAME LCINSE NUMG(H T Yl*C TYPC

\sl vi r 1 cl nl el ,1 10101-10101 O l 0101-1010_J I41110101030l 1013 J 32 7 09 14 tb 25- PG 31 CATECOflY t 5; 00CMET NUMUCR EVENT DATE ACPont DATC h CON'T l - l -l l Ll l Ll l 0 l 5 l 0 l-l 0l 3l 0l 2l l 0l 3 l2 l2 l7 l7 l l 0 l 4 l1 l2 l7 l~

7 0 57 00 09 60 61 60 GU 74 75 t EVENT DESCntPTION j gg l Failure of Make-Up Valve (MUV-24) to open on manual HPI initiation contrary to Techni' cal l 7 u9 t I

@l 7 89 Specification 4.5.2.a. Redundant systems were available and operable. First occurrence t

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Ml of this type. Torque switch setting was increased to assure valve openine.

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@l 7 UG (77-20 L

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C E Co E COMPCNENT CODE if U R VOLA 10N ME lIlBl { lVlAlLlVlElXl lN l l W l 0 l 3- l0 l 47 lN! .

7 89 10 11 12 17 43 44 48 CAUSE DESCRIPTION 'h .

o l The setting of the torque switch for MUV-?4 was too low for consistent openine of valve.

7 09 0

@l 7 89 Torque switch was reset to a higher value.

E 9 FActiTY Status  % POWin OTHin STATUS M(TH00 07 OGCovtny otSCOVCnY CESCRPtCN 1

l Gl l0 l0 l0 l l N/A l lAl l N/A 7-U 9 10 12 13 44 45 46 L ACT IT Y C0ditt4f PE8.tASED AMOUNT Or ACTNiTY LOCATCN OF AELCASE E

7 8 9 W OfdAELEASE l 10 11 N/A 44 I I 45 N/A E

PEnSONNEL EXPOSURES NUMtsER TYPE DESCAIPTON NE l0l0l0l l Zl l N/A 7 89 11 12 13 ft PERSONNEL IN.UAIES Nuuntu CtSCsuPTON d l 0l 0l 0l11 12l 7 09 N/A C

OFFSITE CONSEQUENCES

@l 7 00 N/~A LG LOSS On DAMAGE TO FACILITY TYPC OECCA!PTON .

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/ uD Wl to N/A C'

PUBLICITY

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/ uo N/A _ . . .

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ODITIONAL FACT 0nS See attached Supplementary Information 8002 27o pg I \\ D s-uc r. s m ,;,,c i tTS- , , , , , _ n,m m . ,, , .

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6 Supplementary Information

1. Report No: 50-302/77-26 ,

2. Facility: Crystal River Unit #3

3. Report Date: 12 April 1977

4. Occurrence Date: 22 March.1977

5. Identification of occurrence:

Failure of High Pressure Injection Isolation Valve (MUV-24) to open on

• manual initiation contrary to Technical Specification 4.5.2.a.

6. Conditions Prior to Occurrence:

Plant operating in Mode 3 following Reactor trip. .

7. Description of Occurrence: f, At 1356 on 22 March 1977, following a Reactor trip, while in the progress of maintaining RCS level and pressure, manual high pressure injection was initiated on HPI Train "A". One of two Train "A" High Pressure Injection Isolation Valves (MUV-24) failed to open. Train "A" MUV-23 and Train "B" MUV-25 and MUV-26 were available and operable.

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8. . Designation of Apparent Cause of Occurrence:

The cause of thin event was the torque switch setting being too low for consistent opening of valve. MUV-24 tested satisfactorily on 23 March 1977.

, 9. Analysis of Occurrence:

There were no safety implications as either HPI subsystem in conjunction with core flooding system would maintain temperatures within prescribed limits in the event of accident conditions. Redundancy was maintained.

10. Corrective Action:

The torque switches were set higher to assure opening of the valve.

11. Failure Data:

This oenurrence was non-repetitive.

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