ML20024C496
| ML20024C496 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/05/1979 |
| From: | Logan J METROPOLITAN EDISON CO. |
| To: | |
| References | |
| TASK-02, TASK-03, TASK-06, TASK-08, TASK-2, TASK-3, TASK-6, TASK-8, TASK-GB B&W-4041, NUDOCS 8307120700 | |
| Download: ML20024C496 (5) | |
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PRESIDENT'S COMMISSION ON TEE ACCIDENT AT TIREE MILE ISLAND
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DEPOSITION of METROPOLITAN EDISON COMPANT hy 303E75 3.
LOGAN, held at Three Mile Island i
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. Nuclear Generating Station, Earrisburg, Pennsylvania, on the 5th day of August, 1979, commencing at 8:15 i
s.a.,
before Stanley Rudharg, a Certified Shorthand Reporter and Notary Public of the State of New York.
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113 6-5 1
l Logan 2
personnel coming out here to assist in analy=ing and 3
pushing, if you will, the vendor to get the equipment 4
modified and returned, and support in the sense of 5
their dedication to the plant, I have had no problems 6
at ali.
7 2 can't speak of unit 1 or their problems.
8 g
were you awaze before the date of.the 9
assident, there wis a leak through ons of the valves 10 in the top pressuriser?
11 A
Tes, well aware we had a Isak in one of the 12 relief valves frou the pressuriser.
U g
~ Ead you been able to identify where the 14 leak was ss of the time of the accident?
15 A
In my own mind, I was act positive which one of 16 those three valves was leaking.
In fact, one of the 17 tasks that I bed set up it we did-shut down for any.
M reason, we wanted to go in there with'a pyro.moter to 19 stick it en each of the~1ines to determine which one 20 was leaking.
11 g
Why coulan't you do that while you were in operation?
23 A
nian't have any -- off the record?
24 (Discussion of f the iecord.)
escsssive in 25
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.he radiation imvels up there are
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E ENJAMIN RcpcstT1Nm Semnct l
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1 Logan i
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addition to the temperature being hot, and you would 3
not put anybody inside the D ring when you are critical.
4 Q
During normal operation?
5 A
Tes.
6 9'
What do you mean by the *D ring"?
7 A,
The plant'is laid out in D rings whereethe primary 8
water goes through the steam generator and pressuriser.
9 The pressuriser happens t o be in one of the D rings and 10 your radiation levels in there are very high during 11 normal operations.
12 g
so you have to go through shutdown?
13 A
Tes.
14 Q
I thought you had thermal couples strapped 15 to each of the valves? -
16 A
we do.
17 g
why wouldn't that tell*you which valve was 18 leaking?
19 A
All three of the lines sie together before you go 20 to the drain tank, and when you discharge from any 21 relief valve, t$e temperature is transmitted where they 22 tie together up through the. lines, to give you an 23 erroneous temperature indi=ation -- not an erroneous 2%
temperature indication, but an erroneous indication 25 of a leaking valve on all three, and if you took that S ENJAMIN R EPcR"1NG Scavict
'15 1
5-7 1
Logan 2
as the only criteria, it would be erroneous.
3 g
You couldn't look at the th'ree temperature 4
readings and find that one was higher than the other 5
two and then infer from that which valve was leaking?
hhatisthe. theory.
Novever, in observing these, 6
A 7
at various times, we would see the temperature fluctuate 8
on all three of them.
9 At one time, we thought it was the electromagnetic 10 relief valve.
At another time we thought it was one of 11 the code relief s.
We pursued an identification of one 12 of the code reliefs to verify whether it was in the 13 store room, whether we had one in case we had to re' place 14 one.
15 g
when you realized that you had a leaking 16 valve up there, was the operating procedure for 17 avkluation or identification of a failed to open M
pressuriser or power operated relief valve reviewed to 19 see what inplications, 15any, the possibility of having 2D a leak that valve might have on t_he use of that procedure 21 in an emergency setting?
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22 I can't specifically say with respect to that, 23 that we pulled ouu the procedure and. looked as it, but I
24 I would presume that this was docked at.
l 25 we identified or felt we identified the sour =e of l
j B ENJAMIN R EPC R*1NG SEnvict i
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Logan 116 the leak because we have a techni=al spec that says 1
3 that we can have a certain leak rate in there.
We 4
made a management decision that we would live as long 5
as we sould stay within the tech spess, that we would 6
live with that leak until such time as we could shut 7
down and repair it.
8.9 Regarding the procedure for identifying a failed 9
to open electromatie valve, are you familiar with the 10 fact that there are four to five symptoms listed in 11 the procedure, and do you know whether the operators 12 are able to identify what temperature differential 13 they should be expected to see within the normal 14 operation and in a setting where you have's fully 15 failed to open relief valve what temp'rature rise e
16 they would expect to see, and we are setting aside 17 for the moment the question of a pre-existing leak?
18 A
Do you mean if it were shut or if it were fully 19 opened?
20 g
Right, during normal operation.
21 A
what tesperature difference should you see?
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22 g
might.
E A
I believe that one of the supervisors had 2'
mentioned that in Unit 1, whe= they had observed 25 this valve fully opened, that they saw the temperature I
S EN4 AMIN R EPCRTING service
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