ML20024B770

Responds to NRC Re Violations Noted in IE Insp Rept 50-483/83-21.Corrective Actions:Ae Issued Guidelines Via E-01013(Q)-9-4,consisting of Visual Exam & Physical Testing of Cables.Addl Cables Identified & Tested

ML20024B770
Person / Time
Site:	Callaway
Issue date:	07/01/1983
From:	Schnell D UNION ELECTRIC CO.
To:	Little W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20024B766	List: IR 05000483/1983021 ML20024B770
References
ULNRC-647, NUDOCS 8307110364
Download: ML20024B770 (3)

Text

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UNION ELECTRIC COM PANY Isol GRATIOT STREET S T. Louis, MISSOURI DON ALO P. SCHNRLL o gog g g July 1, 1983

.r. Lo u....o u.....

m........

Mr. W.

S.

Little, Chief Project Engineering Branch U.

S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137 ULNRC-647

Dear Mr. Little:

INSPECTION REPORT NO. 50-483/82-21 This reply is a follow-up to our letters of April 8 and May 4, 1983 (ULNRC-616 and 624 respectively) provided in response to your letter of March 8, 1983 which transmitted the report of the inspection conducted at Callaway Plant, Unit 1 during the period of November 29 to 30 and December 1 to 3, 1982.

An additional interim response to item of noncompliance 50-483/82-21-07 is presented below.

None of the material in the inspection report or in this response is considered proprietary by Union Electric Company.

(50-483/82-21-07) SEVERITY LEVEL V VIOLATION 10 CFR, Criterion V, states in part, " Activities affecting quality shall be prescribed by documented instructions, procedures, or drawings...and shall be accomplished in accordance with these-instructions, procedures or drawings.

Instructions, procedures, or drawings shall include appropriate quantitative or qualitative acceptance criteria for determining that important activities have been satisfactorily accomplished."

Daniel International Procedure WP-303, Revision 13, " Installation of Wire and Cable," states in Section 3.10, " Caution must be observed to prevent exceeding maximum allowable pulling tensions for any particular type cable specified by reference 2.14 (Bechtel Drawing No. E-01013 (Q) ). "

Bechtel Drawing No. E-01013 (Q), Revision 6, " Installation,

~

Inspection, and Testing Details for Electrical Equipment and Cable," Paragraph 5.3.4, states in part, "Neither the pulling tension nor the sidewall pressure shall exceed the maximum value in Appendix B."

Appendix B to Drawing E-01013 (Q) lists the l

maximum sidewall pressure for Cable Code B32 triplexed cable as 450R pounds (R is the radius in feet).

8307110364 830706 JUL 5 23 PDR ADOCK 05000483 g

PDR b

Mr. W. S. Little July 1, 1983 Contrary to the above, the tension exerted in pulling Class lE Cable No. lALB01AA apparently resulted in the maximum allowable sidewall pressure exceeding Bechtel's design specification.

The subject cable was pulled through a three foot radius conduit (lB2FlE) bend with a tension of 2300 pounds, in apparent violation to Bechtel's design criteria of 1350 pounds.

Response

In our interim response of May 4 it was indicated that the affected vendor was conducting tests to verify the validity of the maximum sidewall pressure values originally provided for the subject triplex cable.

Subsequently, the vendor has provided interim results of their test program to cur Lead A/E which indicate that the maximum allowable sidewall pressure tension for the subject 5 kV triplex cable should be limited to 400R with no weight correction factor.

This value differs from the 450R value originally provided to our Lead A/E and listed in E-01013 (0)

Appendix B.

In view of this new maximum sidewall pressure tension limit, it is our judgement that cable lALB01AA experienced a sidewall pressure greater than allowable during its installation.

However, in an effort to determine the acceptability of cables which are believed to have experienced a greater than allowable sidewall pressure, our Lead A/E has issued guidelines via DCN E-01013 (Q)-9-4 which consist of a visual examination and physical testing.

The guidelines require an inspection for damage of the exposed cable at the pulling end for cable in conduit.

In this regard cable 1ALB01AA was examined for damage and given a 36 kV DC Hi Pot test.

The results were evaluated in accordance with IEEE 400, Sec. 6.1 and the cable was found to be acceptable

("use-as-is").

The results of this test are available onsite for NRC review.

I A review by our constructor of all Class lE 5 kV single conductor and all Class lE triplex power cable pull records has identified seven additional cables which we suspect have exceeded their maximum allowable sidewall pressure during installation.

These cables are suspect as a result of the revised maximum allowable sidewall pressure tension value (with no weight correction) recently provided by the affected vendor.

These additional cables have been identified per project procedures and will be tested in accordance with our Lead A/E's guidelines and as

' schedule permits.

We expect that these cables will also be able to be dispositioned "use-as-is".

This response is considered to be an interim response as we are awaiting confirmation of the vendor's interim test results and the disposition of the cables is pending.

We expect to i

1

-disposition the suspect cables by August 17, 1983 at which time a final report will be submitted.

Mr. W. S. Little July 1, 1983

-If you have any questions regarding this response or if additional information is. required, please let me know.

truly'yours, y(_ Dona S

nell JJS/msc

(

cc:

Mr. H. M. Wescott, NRC Region III NRC Resident Inspector, Callaway Plant Missouri Public Service Commission i

L E