ML19259D215
| ML19259D215 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 10/10/1979 |
| From: | MISSISSIPPI POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19259D213 | List: |
| References | |
| NUDOCS 7910170382 | |
| Download: ML19259D215 (2) | |
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I';TERIM RINRT FOR REPCRTA312 OZyICIINCY SC. 79/14 AS DEFINID IN 10 CFR 30.33(e)
P00R ORGINAL I.
Cescriotion of Deficiencv As par: of :he evaluacion of II Sulletin 79-01A, i: was necessary to our suppliers of air ac:ua:ed valves :o see if :he solenoid concac:
valves in question were used en Our valves.
In response :o cur in-quiry, the Henry ?ra:: Cc=pany sen; a letter sta:ing : hey had repor:ed a potential defec: vi:h :he solencids under 10 CTR, par: 21, sec:1:n
. n. o.
The problen vi:h the solenoids is :ha: : hey have a naxinun ra:ing of AX10 rad in:egrated dosacs and 200 F te=perature.
Our specifica:icns 3
I 0
require a rating of 1.6X1C rads in:egrated desage and 330 ? tenper-a:ure.
These solenoid valves or che actuators are a critical par: of the systen as the pneu=acic ac:ua:or syste= is designed to open the valve and hold it open when the ASCO solenoid valve is energized. When deenergized, i:
is designed to vent air frem the cylinder :o allow a heavy coil spring to close the valve and hold it closed. For exa=ple, if :he ASCO solenoid valve is energi:ed bu: is incperable, with the valve in :he open position, deenergizing :he ASCO solencid valve vill not cause :he valve to close.
Conversely, if :he ASCO solenoid valve is deenergized but is inoperable in :he closed positica, energi:ing 1: vill not cause che valve to open.
Af ter reviewing :he functica of valves using the ASCO solenoid valves in ques:ica, 1: has been decernined that sone valves are loca:ed in safety-related systens and : heir operation during an accident is required.
lb351-7910170
Of fica of Inspec:1:n and Infor:enen: Ocecher
'O, 1979 U. S. ::u:laar.c gula:::y CO :nissi:n AIC4-79 /113 a
II.
Safe:y In:lications
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- he safety opera:1:ns of the plan:.
in addi:ica, i: cens:1:u:ed a significan: deficiancy in :he design of :he valve in ::at :he design did no: : nfor= :o :he dasign ::iteria included in the purchase spect-fica:1 n.
III. C7: e::1re A::1:n Takan All cc rective ac:1ca, including ac:1:n :aken : preven: recurrence vill be subni::ad :: /cu in a final rep :: by Ceca =ber 21, 1979.
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