ML19350A175
| ML19350A175 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 12/02/1977 |
| From: | Switzer D CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-77-06, IEB-77-6, NUDOCS 8102180804 | |
| Download: ML19350A175 (5) | |
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p CONNECTICUT YANKEE ATOMIC POWER COMPANY BERLIN, CO N N ECTIC U T P. o. som 27o MAntrono. CONNECTICUT 00101 2036484911 December 2, 1977 Docket No. 50-213 Mr. Boyce H. Grier, Director Office of Inspection and Enforcement Region I U. S. Nuclear Regulatory Comission 631 Park Avenue King of Prussia, PA 19406
Reference:
Inspection and Enforcement Bulletin No. 77-06,
" Potential Problems with Containment Electric Penetration Assemblies"
Dear Mr. Grier:
In accordance with the above referenced Inspection and Enforcement Bulletin, Connecticut Yankee Atomic Power Company hereby provides the requested information in Atta';hment #1.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY D. C. Switzer President DCS:WJD/kwe Attachment l
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CONNECTICUT YANKEE RESPONSES TO NRC IE BULLETIN 77-06 1
Question 1.0 Do you have containment electrical penetrations that are of the G.E. series 100, or are otherwise similar in that they depend upon an epoxy sealant and a dry nitrogen pressure environment to insure that the electric and pressure characteristics are maintained so as to insure the functional capability as required by the plant's safety analysis report; namely (1) to insure adequate functioning of electrical safety related equipment and (2) to insure contain-ment leak tightness?
Ans"er Containment electrical penetrations of the G.E. series 100 type are not utilized.
The installed penetrations are of a type unlike the G.E. series 100 insofar as they were field assembled from. components supplied by several different vendors.
Question 1.1 Have you experienced any electrical failures with this type of penetration?
Answer No electrical failures of the installed penecrations have been experienced.
Question 2.0 For those penetrations referenced in Item 1 above, have you maintained the manufacturers prescribed nitrogen pressure at all times?
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Answer The maintenance of a nitrogen pressure on the installed penetrations is not a requirement.
Question 2.1 If you have operated the. penetrations without maintaining a nitrogen pressure, was any degradation of insulation resistance or anomalous component operation detected?
Answer As indicated in 2.0, maintenance of a nitrogen pressure is not a require =ent, and since no anomalous component operation has been experienced, the need to check insulation resistance has not existed.
Question 2.2 If no measurements were taken during periods when nitrogen pressure was not maintained, how were you assured that the insulation resistance was not degrading or degraded.
N Answer As indicated in 2.0, maintenance of a nitrogen pressure is not a requirement, and since historically insulation resistance degradation has not been a problem, no measures other than those outlined in 2.3 have been implemented.
Question 2.3 How do you determine that circuit insulation resistance values are satisfactorily maintained?
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Answer During each refueling shutdown, insulation resistance to ground checks are made on many of the circuits which access the containment via penetrations.
Question 3.0 Is there a need, as determined by either the vendor or yourself, to main-tain penetrations pressurized during a LOCA?
Answer The design of the installed penetrations is such that they do not depend upon a nitrogen pressure seal during normal operating or LOCA conditions.
Question 3.1 What measures have you taken to insure that penetrations of this type will perform their designed function under LOCA conditions (design reviews, analyses or tests)?
Answer Based upon a review of the design and testing, it is believed that the installed containment electrical penetrations would perform their designed function under LOCA conditions.
- Question 3.2 Are the measures that provide this assurance adequate to satisfy the commissions regulations (GDC 4, Appendix A to Part 50; QA Criteria, Appendix B to Part 5)?
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Answer Based upon information available to us at this time, it is believed that the containment electrical penetrations would perform their design function under LOCA conditions.
This belief is based upon a review of the penetration design which included discussions with the plant Architect Engineer (S & W) who has indicated that the design incorporated materials which were compatible with the expected environment. Also reviewed were the t.ests carried out on the installed penetrations and tests performed by other licensees on similar penetrations.
Documentation to corroborate the above conclusions is not in all cases available at this time. However steps are being taken to rectify this situation.
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