ML19308D470

RO-77-89:on 770715,valve DHV-41 Failed to Open from Control Room During Cycling Surveillance Procedure.Caused by Shift in Torque Switch Setting.Torque Switch Contacts Burnished & Switch Reset

ML19308D470
Person / Time
Site:	Crystal River
Issue date:	08/09/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D464	List: ML19308D463 ML19308D470
References
NUDOCS 8002280780
Download: ML19308D470 (2)

Text

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• 5o n DOCKET NUMOEA EVENT OATE AEPOAT catt O 1 CON'T l - l - l 7 0 57 00 d59 W 60 l0l5l0l-l0l3l0l2l 61 68 l 017 l 1 l 5 l7 l 7l 69 74 l0 l8 l0 19 l 7 l 7 l 75 00 EVENT DESCRIPTION Ql During the iserformance of 'the quarterly valve cycling surveillanca procedure SP-370. I 7 oD 80 03 l valve DHV-41 would n#ot open from the control room contrary to Tech Spec 3.6. 3.1. l 7 89 '

00 Ql Redundancy NA as valve DHV-4 remained closed. Second occurrence, refer LER 77-9, l 7 89 .

80 gl dated 9 February 1977. Maintenance restored operability of DHV-41. (LER ' 77-89) l 7 U9 80

$I 7 89 I pme SO No't CIDE COMPONENT COCE mat FACnAA VOLATCN

• 8 Ic IP I LrJ 7 89 10 11 12 Iv li It lv iw Ix I 17 Ld 43 IAi7 ln in I Luj 44 47 48 .

CAUSE DESCRIPTION 0 .

Oo l Valve DHV-41 would not open due to a shift in the torque switch settSc.

7 89 The torcue l' 00 09 l switch vas reset to ensure opening of the valve. ~

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• I s US  % POWER OTHER STATUS OtSCoVEAY DISCOVERY OCSCRIPTON lEl 1019l0l l NA l lBl l NA l 70 9 10 12 13 44 45 46 FORM oF 80 ACTNITY CONTENT ,

DELEASEo AMOUNT OF ACTN'"v . LoCATON OF RELEASE 12 \Zl W CFRELEASE[ NA l l NA  !

7 8 9 10 11 44 45 00 PERSONNEL EXPOSURES NUMBER TYPE DESCA PTCN 13 l0 l0 l 0 l l Zl l NA l )

7 89 11 12 13 60-PERSONNEL INJunlES

• NUMOER DESCRIPTON 14 l0 l0 l 0 l l NA l*

7 89 11 12 80 OFFSITE CONSEQUENCES 15 l

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7 09 CO LOSS OR OAMAGE TO FACIUTY TYPE CESCAIPTCN .

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60 PUBUCITY 8I 7 BD NA l 00 ADDITIONAL FACTORS l' See attached Sucoletentarv Information ,j ou

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NAME: ' tJ . P. Stemrt g PHONE: 0 13) 866-4159 CPO A ff I . e. r. 7

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• SUPPLEMENTARY INFORMATION

1. Ifeport No.: 50-302/77-89

2. Facility: Crystal River Unit #3

3. Report Date: 9 August 1977

4. Occurrence Date: 15 July 1977

5. Identification of Occurrence: i Containment isolation valve DEV-41 would not open from the control room contrary to

! Technical Specification 3.6.3.1.

6. Conditions Prior to Occurrence

Mod; 1 power operation.

7. Description of Occurrence

I 4

At 1400, while performing the quarterly cycling of valves surveillance procedure SP-370, .

Decay Heat Valve DEV-41 would not_ open from the control room. Maintenance was initiated "

l and DEV-41 restored operable.

8. Designation of Apparent Cause:

The cause of this event was due to a shift of the torque switch setting.

9. Analysis of Occurrence:

In the ovent of an Engineering Safeguard actuation, there were minimal safety implica-l tions as a result of this occurrence. The alternate long term cooldown path via the pressurtzer spray system was operable and available, and valve DRV-41 could have been operated at its local station, since it is located outside Containment.

10. Corrective Action:

i The torque switch contacts were burnished and the switch reset to ensure opening of the valve.

, 11. Failure Data: -

This was the second occurrence of this event. Refer to LER 77-9, dated 9 February 1977.

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