ML20198L540

Concurs W/Draft Sser 7,assuming That Ref Documents Reviewed & Interpreted Correctly by D Hansen.Itt Grinell Snubbers Discussed.Technical Review Team File Re Mechanical 8c Piping Category 48 Not Found.Related Info Encl

ML20198L540
Person / Time
Site:	Comanche Peak
Issue date:	02/12/1985
From:	Thompson E NRC
To:	Shou NRC
Shared Package
ML20197J316	List: ML20197J311 ML20198K377 ML20198K383 ML20198K450 ML20198K456 ML20198K467 ML20198K472 ML20198K479 ML20198K489 ML20198K502 ML20198K506 ML20198K511 ML20198K513 ML20198K518 ML20198K527 ML20198K537 ML20198K556 ML20198K562 ML20198K568 ML20198K574 ML20198K581 ML20198K588 ML20198K600 ML20198K844 ML20198K853 ML20198K872 ML20198L117 ML20198L169 ML20198L186 ML20198L203 ML20198L212 ML20198L218 ML20198L235 ML20198L257 ML20198L261 ML20198L275 ML20198L291 ML20198L303 ML20198L317 ML20198L325 ML20198L337 ML20198L367 ML20198L379 ML20198L384 ML20198L388 ML20198L395 ML20198L401 ML20198L406 ML20198L420 ML20198L431 ... further results
References
FOIA-85-59 NUDOCS 8606040310
Download: ML20198L540 (51)

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2 "e-~. ;1 DCP7-TASK NO. AV-5 Task: Defects in Vendor Supplied Snubbers Ref. No.: Task No. AV-5 Characterization:

ITT Grinnell was notified by a customer that dimensional conditions existed in certain mechanical shock and sway suppressors which would preclude the ability for the units to achieve the minimum required included angle cone of action.

Initial Assessment of Significance:

This problem relates to hardware that was deficient that could fail to perform its intended function.

Source: Mechanical and Piping (no category)

Approach to Resolution:

1. Review letters, ITT Grinnell to TUCI, to NRC, Memorandum IE Infonnation e Notice No. 83-20, Deficiency Review Report 012.

2. Evaluate allegation for generic / safety implications.

3. Report on results of review / evaluation of allegation.

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Admi ni s tr at I ve Wr i t trup integrated into SSER___________

Pot ent i al Violttions to Region IV___________

Wor t.p e c t. age File Complete __,___________

Wort.ptcl: age Returned to Group Leader __________

F01A-85-59 quz.

DCP 7 - Task AV-5 Draft 3 - 10/?4/84 (1) Allegation Group: Mechanical and Piping Task No. AV-5 Category 48 Dimension problems of pipe clamps for snubbers.

(2) Allegation No.: AV-5 (3) Characterization: ITT Grinnell Corp. was notified by one of its customers on October 9, 1978, that dimensional conditions existed in certain mechanical shock and sway suppressors which would preclude the ability for the units to achieve the minimum required included angle cone of action.

(4) Assessment of Safety Significance:

To assess the safety significance of this reported problem and its concern to the Comanche Peak Power Plant, the Technical Review Team (TRT) review several letters between the supplier (ITT Grinnell and the Nuclear Regulatory Comission (NRC), ITT Grinnell and Texas Utilities Services, Inc. (TUCI), NRC inspection memorandum, IE Information Noti <. No. 83-20, and Deficiency Review Report 012.

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ITT Grinnell was notified by one of its customers on October 9.1978, that dimensional conditions existed in certain mechanical shock and sway suppressors which would not allow the snubber to function properly through its full cone of action.

On November 16, 1982, ITT Grinnell sent a letter to TUCI informing them that there is a chance of insufficient clearance between the Pacific Scientific Shock Arrestor and the ITT Grinnell manufactured pipe clamps.

Affected could be the included angle cone of action to the pipe clamp S

axis.

ITT Grinnell also sent a letter dated March 28, 1983, to the NRC Region IV in response to a letter that the NRC had sent to ITT Grinnell dated March 8, 1983. The letter stated in part: "such tearing would not apply to the somewhat more flexible piping systems allowing some freedom of movement by the snubbers which are a consideration in your letter. Although the piviot movement was intended to be 5 , an interference with such movement would not cause pipe rupture or pipe failure. Thus, this consideration is not a primary cause of potential safety related pipe failures."

On April 14, 1983, ITT Grinnell sent another letter to the NRC Region IV Office explaining how their company would resolve the violation of noncompliance with the ITT Grinnell procedures for compliance with the requirements of the 10 CFR Part 21 regulation concerning a deviation identified by a Grinnell customer on October 9,1978. The NRC Region IV

s Office sent a response to the ITT Grinnell letter dated August 19, 1983, stating that "Your committed corrective actions and preventive measures appear to provide a successful resolution of identified violations.

Accordingly, we have no further questions at this time and will review your corrective actions and preventive measures during a further inspection."

Another letter was sent to TUCI by ITT Grinnell dated June 14, 1983. This letter presented test data that ITT Grinnell had gathered from testing a

their mechanical snubbers using worst case tolerances and conditions.

They found that even under these conditions, the snubbers continued to function effectively as designed.

On September 13, 1983, project pipe support engineer for TUCI issued an IE Infornation Notice No. 83-20 which spells out the action that was followed to insure that all safety related snubbers at the Comanche Peak Power Station were inspected during the Hot Functional Test Program. Also, field engineering was directed to verify that those supports which were not under the Hot Functional Test Program had no interference problems.

Based on the results of the inspections conducted and testing conducted by ITT Grinnell, the project pipe engineer stated that there is no problem with any of the subject ITT Grinnell hardware.

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(5)

Conclusions:

Based on the information available, the TRT could not identify any significance or generic implications with this problem at Comanche Peak Power Station.

(6) Action Recuired:

None.

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- - M L (8) Attachments:

None.

i (9) Reference Documents:

Letters between supplier and NRC Region IV.

Letter from supplier to TUCI.

IR NRL 18/82.

IE Infonnation Notice No. 83-20.

Deficiency Report Report 012.

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(10) This staternent prepared by:

Name Date 1

Reviewed by:

Name Date a

4 Approved by:

Name Date 1

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