ML20081K601
| ML20081K601 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/17/1983 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| REF-PT21-83 10CFR-050.55E, 10CFR-50.55E, ANPP-28016-BSK, DER-83-47, NUDOCS 8311100188 | |
| Download: ML20081K601 (3) | |
Text
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Arizona Public Service Company PO box 21666
- PHOENIX, ARIZONA 85036 October 17, 1983 ANPP-28016-BSK/RQT U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Resident Reactor Projects and Engineering Programs
Subject:
Final Report - DER 83-47 A 50.55(e) Reportable Condition Relating To Power Supplies May Damage Instrument Conductor Penetrations File: 83-019-026; D.4.33.2
Reference:
(A) Telephone Conversation between P. Johnson and R. Tucker on July 26, 1983 (B) ANPP-27685, dated August 30, 1983 (Interim Report)
Dear Sir:
Attached is our final written report of the Reportable Deficiency under 10CFR50.55(e), referenced above.
Very truly yours, O
2
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E. E. Van Brunt, Jr.
APS Vice President, Nuclear Projects Management ANPP Project Director EEVB/RQT:sn Enclosure cc: See Attached Page 2
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?i 8311100188 831017 C.'j' @ l/*J PDR ADOCK 05000528 j5139 S
PDR I
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-5281
e Mr. T. W. Bishop DER 83-4 7 Page 2 cc:
Richard DeYoung, Director Of fice of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 T. G. Woods, Jr.
z G. C. Andognini J. A. Roedel D. B. Fa snacht A. C. Rogers B. S. Kaplan W. E. Ide J. Vorces J. R. Bynum D. D. Green /P. P. Klute A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli S. R. Frost J. Self D. Canady Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway - Suite 1500 Atlanta, Georgia 30339
i e
e FINAL REPORT - DER 83-47 p
DEFICIENCY EVALUATION 50.55(e)
ARIZONA PUBLIC SERVICE COMPANY (APS)
]
PVNGS UNITS 1, 2 and 3 I.
DESCRIPTION OF DEFICIENCY A study was conducted to identify:all power, control, and instrument penetrations where the power supply has sufficient energy to damage the penetration conductors. The results indicated that for power circuits sufficient primary and backup breakers and/or fuses are provided.
Instrument circuits with a high voltage power supply (approx. 2000 volts) were evaluated as the most likely instrument circuits to require backup fuses.
The evaluation indicated that sufficient energy was not available to damage penetration i
conductors, so all instrument circuits were eliminated from the study. For control penetrations, 106 cases were identified where sufficient energy was available to damage the penentration i
conductors, so backup fuses are required.
II.
ANALYSIS OF SAFETY IMPLICATIONS Given the maximun short circuit current vs. time conditions that-could occur, sufficient energy is available to damage the i
penetration conductors during a single random failure of a circuit overload protection /evice. This could esult in a loss of i
containment integrity. This condition violates RGl.63 and FSAR j
section 1.8 (Confersnce to RG1.63). Accordingly,: this condition is -
j evaluated as repor'.able under 10CFR50.55(e) since if lef t uncorrected it woald represent a significant safety hazard.
III. CORRECTIVE ACTION The condition will be corrected in each unit by issuance of. Design Change Packages ISE-PK-029, 2CE-PK-029, 3CE-PK-029, ISE-PH-036 and -
3CE-PH-036 to provide additional fuses for each of the 106 cases.
With these DCP's implemented,1the design.will provide-aicombination of breakers and fuses or two fuses as primary and. backup overload
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protection devices. Where two ' fuses ' are being > used, the primary and '
backup fuses have different ratings and/or model numbersi to. ensure i
that the design is not susceptable toLa common mode-failure, due to-i a manufacturer defect.
^
i An FSAR Change Notice #1111 was ' submitted to' revise section 1.8 (Conformance -to RG1.63) which states 'the following " Primary and backup fuses are provided for low voltage control circuite where the i
circuit resistance does not -limit the fault current to a level that^
does not damage the-penetration."
l In addition' to reportability under 10CFR50.55(e), Bechtel PVNGS -
~
1 Project considers the deficiency to te potentially reportable under -
the requirements specified under 10CFR Part 21. ' Deficiency I
4
' Evaluation Repirt 8}. 7 addresses the reporting requirements.
l specified. under J 10CFR ' 21. 21(b)' ( 3). 21. 21(b) - ( 3).
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