ML19308D479

RO-77-88:on 770715,containment Isolation Valve SWV-47 Failed to Close During Quarterly Cycling Procedure SP-370.Caused by Loose Control Wire Connection to Limit Switch.Connection Tightened & Valve Restored to Operable Condition

ML19308D479
Person / Time
Site:	Crystal River
Issue date:	08/08/1977
From:	Stewart W FLORIDA POWER CORP.
To:
Shared Package
ML19308D473	List: ML19308D472 ML19308D479
References
NUDOCS 8002280788
Download: ML19308D479 (2)

Text

. _ _- ..

O ' "'":"'"*' ' ' '

e

"^""""'~'*""'"'"'"'"'""=

'~

iau'e UCENSE NUMBEA

, T l F l L l Cl R { P l 3 l l 0 l 0 l-l 0 l 0 l 0 l 0 l 0 l-l 0 l 0 l l4l1l1l1 l1l l0 l 3 l

,)9 - -

14 15 25 26 30 31 32 .

CAThCcAY "r7PE S[2 N E CCCKET NUMBER EVENT oATE AEPoAT OATE O 1 CONT l -l -l l Ll l Ll l0 l5 l0 l-l0 l3 l0 l2 l l 0l 7 l1l5 l7 l7 l l0 l 8l 0l 8l 7l 7 7 8 57 58 59 60 61 68 69 74 75 c EVENT DESCRIPTION O2 l While performing the quarterly valve cycling procedure SP-370, containment isolation 7 89 i g l valve SW-47 failed to close contrary to Tech- Spec 3.6.3.1. Redundancy was maint'ained .

7 89 -

t Q l with SW-25. First time occurrence. Maintenance restored operability of SW-47.

7 89 E gl (LER 77-88) 7 u9 . e RI 7 89 .

p ,E E.

cE CocE COMPONENT C DE VEXATCN O lxlAl lEl lC IK lT lB lK b l lAl lZl9l9l9l d48 . _ .

7 89 10 11 12 17 43 44 47 CAUSE DESCRIPTION 9 '

~

[

[OT81 l This event was caused by a loose control wire connection to the limit switch. The

~

7 89 .. - E. '

g l connection was tightened and SW-47 was restored operable.

7 89 .. _ E.

d.!

[ 's'TE v. PowEn o men status "EcovE[Y C

cascovERY CESCAPTCN -

h. .,l E l l 3l 6l 2l l NA- -l lB l l NA 78 9 10 12 13 44 45 46 BC AMCUNT'oF ACTMTY -

LCCATCN OF RELEASE

~ -

-' - - AItNs$a

, 7 8 . . , _9 l Z! _]- oF Nd5E l NA l l NA 10 11 44 45 66 PERSONNEL - EXPOSURES " - -

NUM8ER TYPE CESCAPTCN ~.-

13 l 0l 0l 0l lZl l NA -

7 8 '9 11 12 13 BC PERSONNEL INJURIES NUMBER CESCAPTON .

7 1 14 l O! O! Ol l 'NA 7 8' 9 11 12 V 63 OFFSTTE CONSEGUENCES .

lTJi] l NA *

• I 7 89 - OC.

LOSS OR DAMtGE TO FAC:UTY TYPE CESCRPTON .

VA ..

.. 7 80

.. 10 GC PUBL! CITY .

$_l 7 89 NA

- iG l

ADDITIONAL FACTORS 002 2802 P8

,g l SEE ATTACHED SUPPLEMENTARY INFORMATION '

• - M E. W. P'. Stewart [ ,, \ PHONE: 813/866-4159 0

(%/ ) CPO 449 64F

. . . - - -- ~ - - -

~

SUPPLEMENTARY .INFORMATION im Report No.: 50-302/77-88

2. -Facility: Crystal River Unit #3 * *

3. Report Date: 8 August 1977

4. Occurrence Date: 15 July 1977

5. Identification of Occurrence:

Containment isolation valve SW-47 inoperable contrary to Technical Specification 3.6.3.1.

6. Conditions Prior to Occurrence:

Mode 1 power operation.

7. Description of Occurrence:

At 0700, while performing the quarterly valve cycling surveillance procedure, SP-370, Nuclear Services Closed Cycle Cooling Valve SW-47 would not close from the Control s.

Room. Redundant valve SW-25 was manually closed and valve SW-47 was taken out-of-service for maintenance. Maintenance was performed restoring SW-47 operable.

8. Designation of Apparent Cause:

This event was caused by a loose wire on the limit switch.

9. Analysis of Occurrence:

There were no safety implications due to this event, as redundant valve SW-25 was utilized for containment isolation.

10. Corrective Action:

None required as normal maintensace restored operability of SW-47.

11. Failure Data:

This was the first occurrence of SW-47 failure to operate.

s 6

w

. - , - , - w qw -