ML20083M027
| ML20083M027 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 12/20/1983 |
| From: | Mietz G ASCO/DELTA (FORMERLY DELTA CONTROLS & RTE-DELTA CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-84-198-000 PT21-84-198, PT21-84-198-000, NUDOCS 8404170445 | |
| Download: ML20083M027 (6) | |
Text
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50-995
$D - W(,o WE/ DELTA emmsaw December 20, 1983 Director Office of Inspection and Enforcement c
Region IV l
h $ h[fM M United States Nuclear Regulatory Commission j
611 Ryan Plaza Drive I#
i E 2 91983 [
[
Arlington, Texas 76102
Dear Sir:
kh i
RTE Delta Corp is located in Stockton, California and is the manufacturer of the generator control panels which serve the Emergency Diesel Generators in the Nuclear Power Plant at Texas Utilities Comanche Peak Station Glen Rose, Texas.
Attached are copies of the following correspondence:
Texas Utilities letter of 11/7/83 to Transamerica Delaval, Inc.
i (the manufacturer of the Emergency Diesel Generators and the purchaser of our panels).
l Transamerica Delaval, Inc. letter of 11/21/83 to RTE Delta Corp requesting our response to the TUSI letter.
RTE Delta Corp letter of 12/2/83 responding to the TUSI request for an explanation and resolution.
It is appropriate to point out that the "nonqualified" component, the States type M-25004 sliding link terminal block actually installed in the panels, is very similar to the Buchanan 4B104 short circuit terminal block the drawings call for.
The one ageable material, the molded insulating base, is the same for both.
Furthermore, the States Co. advises their product is now prequalified.
Consequently, the effect of this chain of events does not in any way degrade the qualification of these panels, but rather, provides a minor alteration in function that was not specified nor desired.
It is for that reason that I propose a rather simple field change to bring the panels into agreement with the original specifications.
We do not yet have Transamerica Delaval's reply to our recommendation.
When it is received, you will be notified.
Sincerely, RTE DELTA CORP G.
Mietz General Manager 4 04j4 Q $5 g Ig ment S
RTE.DELT A CORP.
705 NORTHCARLTON AVENUE
- P O. BOX 1995 + STOCMTON,CAUFORNIA 95201 e PHONE (209) 9414111
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705 N. Cartton Ava.
' RTE DELTA scde =
209/941-4111 TLX 359-447 December 2, 1983 1
Transamerica Delaval, Inc.
PO Box 2161 Oakland, CA.
94621 Attn: John Witt
Subject:
TUSI Your P/0 62613 Our S/0 54925 Ref: Your 11/21/83 letter Terminal Block Discrepancy
Dear John,
A quick check of the record reveals a series of unclear instructions and half hearted compliance with them which I am reluctant to reveal, but which may justify the final r,ecommendation I will make, so here are the facts.
- 1. On 12/17/76 TOI returned drawings including 054925-3 marked to provide sliding-link terminal blocks for all PT and CT second-artes, a total of five 4-point and one 2-point block.
- 2. No one here questioned this strange request which is not reflected in your specification 76001-103.
We proceeded to add four 4-point sliding-link terminal blocks to our drawings for all but one set of CT secondaries (the non-differential set from the generator.) On our Bill of Paterial, however, the part number for this item (No.59) is for a short-circuit terminal block.
- 3. The matter lay dormant until 8/1/78 when I received a telephone call from Mr. I. Shah of Gibbs & Hill to advise where the sliding-link terminal blocks are employed.
I referred him to our drawing 054925-5 which now included a terminal block layout, and explained they were used on all PT secondaries and some CT secondaries.
We agreed that this was odd.
He would prefer shirt-circuit type terminal blocks only on CT secondaries.
He also agreed this was not specified.
I told him I would check with Delaval.
- 4. On 8/1/78 I discussed this with Al Louis and explained how it dev,
eloped that we now have sliding-link TB scattered thru the circuits but that Mr. Shah would prefer short-circuit blocks only on the CT secondaries.
Sliding-link TB are not needed at all, Mr. Louis told me he would advise how we are to proceed.
- 5. On 9/5/78 you sent us a PEMS requesting that 2 pushbutton switches i
be changed to selector switches and that drawings be revised accord-ingly.
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- 6. On 9/22/78 I gave a note to our sales department so they could quote you a price for the pushbutton to selector switch change and suggested that you be given a price to eliminate the sliding-link TB and add short-circuit TB only to the CT: secondaries.
- 7. One 9/25/78 we quoted TDI prices for the P.B. switch change and the T.B. change.
- 8. On 10/25/78 Delaval advised to proceed with the P.B. switch change only. We were instructed not to add the short circuit terminal blocks to the CT circuits.
This now brings us to the present.
I was not aware that the part number listed in our Bill of Material, item # 59 (Buchannan No. 4B104) was a short circuit terminal block.
You will note that in both our qualification plan (NES-26296-1, P.6) and our qualification report (NES-26296-ITR, P.69) it is still listed as a sliding-link terminal block, same as in the Bill of Material B-54925, sh. 2.
The only explanation I have for this is that my prede-cessors here prepared this Bill of Material and I am not sufficiently familiar with Buchannan products to know that their part no. 4B104 is not a sliding-link terminal block.
So I erroneously followed the false trail they blazed, as evidenced by the qualification plan and report cited above, which were prepared under my direction.
My recommendation to resolve this matter is to replace the sliding-link term-inal blocks with standard GE type EB-25 terminal blocks and revise our documentation accordingly.
My reasons for this are as follows:
A. They are available pre-qualified B. The qualification can be combined with that for the other terminal blocks (Bill of Material, item 49) already documented in our qual-ification plan and report, if we need to proceed quickly by procur-ing commerical grade blocks.
C. Customer has no use for the sliding-link feature of the terminal blocks now installed.
D. Customer apparantly does not need the short-circuit feature dis-cussed with Mr. Shah (see fact 3, pg.1) since it was rejected by TDI when proposed by RTE (see fact 7 & 8 above.)
E. To add short-circuit terminal blocks to the CT secondary circuits at this time would involve a major rewiring, since the CT secon-dary circuits are not conveniently grouped on the existing terminal blocks and certain potential circuits would have to be wired to other T.B. locations.
F. It would eliminate the discrepancy between the Bill of Material and the equipment, since we would revise the Bill of Material, the draw-ings, the qualification plan and report to reflect this action.
We regret that this situation was permitted to develop.
If our proposal is accepted, we would offer to supply replacement EB25 4-pole terminal blocks with cov-ers, similar in every other way to the 12 point terminal blocks used through out the panels, provided they are installed by others.
The dimensions and mounting of these replacement blocks is the same as the sliding-link blocks they would replace and the existing wiring and mounting provisions would not be altered.
We would include the documentation changes along with those now under discussion with you concerning the change out by TUSI of the G.E. differential relays in the field.
We await your direction in this matter.
At this time, it is appropriate to suggest, again, that the updating of our drawings to reflect all the DCA's affecting our panels (see our 8/5/83 letter to you) also be resolved before we proceed with documenting any changes, regardless of cause.
Very Truly Yours, RTE /0 ELTA CORP.
4de d paul Hessemer Manager of Engineering PH/ph cc: Bud Greer 1
1
Transimitica Del vil Inc.
j Transamenc<.
en,nxnd com,,1...
y,,on ggg) 550 85th Av;nue P.O. Box 2161 m-Oakland, California 94621 9 A (415) 577 7400 I
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November 21, 1983 i
RTE-Del ta Co rporation P.O. Box 1995 Stockton, Cali f.
95201 Bud Greer/}h i h m w Attention:
Subject:
TUSI/COMMANCHE PEAK
Dear Mr. Greer:
The attached correspondence from TUSI is sel f expl anatory,
and requires your immediate attention and reply.
Sincerely,
.7'
.'_ c.,',l /}
'e, Jo'hn Witt Purchasing Agent i
JW :j t Enclosure i
i
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TEXAS UTILITIES SERVICES INC.
P. O. Box teet
- CLEN ROSE. TExA5 7e00 j
h TSG-3331 November 7, 1983 Transamerica Delaval Inc.
Engine and Compressor Division g
P. O. Box 2161 WVD Sp gN8 j g ADMINISTRATION BLB Oakland, California 94621
' OUCI
'5-I7 ISS)
Attention:
W. V. Dilworth CCC HAND'.!
D:!T 5**
COMANCHE PEAK STEAM ELECTRIC STATibb C##^?
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~i OOf MS-34 Generator Control Panel Terminal B1; ks P. O. CP-0034 Pg Gentlemen:
y l'2/~F.
As a follow up to the telephone conversaik ov er 1983 between Vince Dilworth, Perry Desai and Walker Hart,'tne follo ing describes the problem we have encountered:
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In an effort to replace a broken Class 1E terminal blocks in the Delaval Diesel Generator RTE Generator Control Panel, it was found when fabricating these panels, States Company sliding link terminal blocks were installed rather the the Buchanan 4B104 terminal blocks called for on the attached copies of RTE Delta drawings (identified as item No. 59 on Page 13 and Section 6.32 of Equipment Qualification Test Report Analysis in RTE Delta Qualification Report No.
NES-26296-ITR).
Cetting a replacement terminal block is not an urgent requirement now as a replacement block can be transferred from Unit #2, however, it is imperative that the situation of having non-qualified Class 1E terminal blocks in service in these panels be resolved.
Please investigate this discrepancy and provide a resolution as soon as possible.
If additional information is required, call either Perry Desai (Ext.
213) or W. Hart (Ext. 449).
Very truly yours.
0 r3 Peter tevens Supervising Engineer TUSI Nuclear Engineering Y04 }50 PBS:CLW:LWH:PRD:aq Attachment cc:
R. D. Calder L. Popplewell I. Vogelsang/ Fred Hunstable J. Rankin
.