ML19317F901
| ML19317F901 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/20/1974 |
| From: | Colombo R SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML19317F891 | List: |
| References | |
| NUDOCS 8002210626 | |
| Download: ML19317F901 (2) | |
Text
UCENSEE EVENT REPORT 3
CONTROL BLOCA,
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(PLEASE PRINT ALL REQUIRED INFORMATION) i e
TME UCENSE NUMBER Y
lC l A lR l Sl Sl 1l l9 l9 l-l 9 l 9 l 9l 9l 9l-l9 l9 l l 4 l1 l1 l1 l1l l0l1l 1
7 89 14 15 25 26 30 31 32 bAbk CoCKET NUMBER EVENT DATE REAQAT DATE CATEGORY p
O 1 CONT lP l0 l y l Ll l015 l0 l-l 0 l 3 l 1l 2l l1l1l0l1l7l4l l 1l 1l 2l 0l7 l 4 l 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRIPTION BE l The reactor was at cold shutdown conditions for minor repairs to the turbine l
7 89 80 EE l stop valves. During a surveillance test of the NSCW
'B' the flow was measured l
7 89 80
@l at 5500 GPM.
This is 500 GPM less than recuired in the Technical Specifications. l 7 89 80 32 I bdundant systm NSCW
'A' was fully coerational. The cosition of the flow l
7 89 eO
@l control valve had chanced toward the closed position from its preset throttled l
7 89 (see follouing paQe) 80
,,,u,
F A
VCLATON O
l Sl Bl lEl lV l A l Ll Vl 0lP l lAl lFl1l2l5l l Nl 7
7 89 10 11 12 17 43 44 47 48 CAUSE DESCRIPT!ON O8 l The valve operator worm gear threads wore and allowed free movement of the valve j~~
7 89 80 US l internal butterfly. These throttle valves are locked valves and there is no l
7 89 80
- l FACUTY immediate need to operate the valves. To prevent moveT1ent of the internals, l
METHCo CF (300 f0llCWing page)
SU STATUS
% PCWEA CTHER STATUS C SCOVEAY O'SCOVERY CESCR2pT:04
[Bj l0l0l0] l l
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7 8 9
10 12 13 44 45 46 5;
AE E ED C8 E.
SE avC.NT 08 t.
N TY LCCAT ON cr cI6 EASE In2J l 91 Wl i
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7 8 9
10 11 44 45 53 PERSONNEL EXPCSURES NUMBEA TYPE DESOA'PTCN in1 l 9l9 l9 l l
l 7 89 11 12 13 53 PERSONNEL INJURIES NUV8EA DESCA.pTON E 191919 l l
l 7 89 11 12 60 OFFSITE CONSEQUENCES EE l 7 89 30 LOSS OR DAMAGE TO FAC:UTY TYPE DESCALPTCN ma L9J l
i 7 89 10 BC PUGUC1TY l
7 89 80
,m ADDIT lONAL FACTORS
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% /8 9 sr 0 0 02 31062C
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7 89 eO NAME:
Ronald U. Colombo PHONE:
GPO 881 667
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d EVENT. DESCRIPTION (Cont.)
setting.. ' A'similar' event concerning low NSCW flow occurred on loop A on October 6, 1974.and was reported as abnormal occurrence 74-7.
The' corrective action requires the throttle valves,to be lock pinned in place'to prevent movement of the butterfly during flow induced-vibra--
tions. - (50-312-74-9) i e
1 CAUSE DESCRIPTION (Cont.)
The stop pins were fabricated and secured to the body of the operator.
valves were throttled to the correct flow through the NSCW system and This modifica-the stop pins were seated against the valve operator.
tion prevents' relying on.the worm gear to hold the operator in place.
.The valve operators are manufactured by Fisher Control Continental Division and are designated Type 9170 for Double R/L Valves.
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