ML20087C712

Supplemental Deficiency Rept CP-86-45 Re Potential for Interaction Between Noncategory I Equipment & Components for Seismic Category I Structures,Sys & Components.Initially Reported on 860606.Seismic Evaluation Program Implemented

ML20087C712
Person / Time
Site:	Comanche Peak
Issue date:	01/08/1992
From:	William Cahill, Walker R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CP-86-45, TXX-92022, NUDOCS 9201150010
Download: ML20087C712 (3)

Text

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1. CP 86-045 2

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903.7 Ref. # 10CFR50.55(e)

TUELECTRIC wimm .t. c.hm, Jr. January B. 1992 aro.e nu er wan U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)- UNIT 2 DOCKET N0. 50-446 SEISMIC CATEGORY 11 SYSTEMS AND COMPONENTS SDAR: CP-86-45 (SUPPLEMENTAL REPORT)

Gentlemen:

On June 6, 1986 TV Electric orally notified the NRC of a deficiency involving the potential for interaction between Non-Category I equipment and components and Seismic Category I struttures, systems and components. This deficiency was identified by an interdisciplinary design review of a Unit 1 proposed Design Change Authorization for a Seismic Category 11 handrail where the anchoring details were qualified but the integrity of the handrail structure itself was not considered. The purpose of this report is to address the methodologies, scope, and corrective actions to resolve this deficiency for Unit 2.

For Unit 1 and common, this deficiency was resolved by iden',1fying Non-t Category I sources which could potentially interact with safety targets.

l .followed by evaluations of these sources and targets for acceptability using l dynamic impact criteria per project procedures and Design Basis Documents.

Interactions not resolved in this way were resolved by structural integrity evaluations of the Non-Category I sources. This evaluation used a combination of an established earthquake experience database, existing component seismic qualification records and anchorage design calculations.

i For Unit 2, TV Electric will resolve this deficiency by inplementing a seismic evaluation program similar to the Unit I approach for resolving SDAR CP-87-62 " Class 5 Pipe Supports". The objective of the program is to demonstrate the seismic integrity of existing Hon-Category I installations in Seismic Category I buildings as described below. In a limited number of specific cases, source-target evaluations may be performed to confirm that unacceptable interactions will not occur.

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9201150010 92010A PDR S

ADOCK 050GO N FDR no N. ouve street LB. sl Danas. Texas 75201

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.. l TXX-92022 '

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The seismic evaluation program consists of the following..

1. An area engineering walkdown is performed within Seismic Category. I structures to identify potential, source candidates for further evaluation. Engineering walkdowns are performed'in accordance with project procedures which define the screening criteria for. source commodities based on earthquake experience data, the Unit'l progrcm including Post Construction-Hardware Validation-Program (PCHVP) results and engineering experience.

2. Candidates identified _during area walkdowns-are_evalueted specifically or by a bounding analysis for structural integrity.

3. Where structural iriterrity cannot be adequately demonstrated Jusing-specific _ evaluation or bounding analysis l techniques, commodities will either be modi.~ied or-justified as acceptable using source-target e ,luation methods similar to those used in Unit-1.

New Unit Non-C0tegory I commodities installed in the Unit 2 add' Common Area will be re,; ired to maintain' structural integrity for safe shutdown earthquake (SSE) loading. New Unit 2 Seismic Category I systems / components installed _in the Unit 2 and Common Area will be evaluated to confirm that they will--not be adversely affected by existing sourct;.

The Unit 2 seismic evaluation described above is also-being utilized for the resolution of the Non-Category liportions of- the following SDARs whim : are-consolidated into the subject SDAR. (The Sefsmic Category 1 portions of these

• SDARs remain as stated-in the previous correspondence for each: issue).

SDAR CP-85-29 Design-of Architectural Features-(Lighting fixtures.7 speakers, horns, smoke; detectors and anchorages of miscellaneous items as described in TXX-91283)

SDAR CP-85 -34 Design _of Conduit Supports' (Train C > 2" including. Junction Boxes) 5DAR CP-85-35 . Design-of . Cable Tray Hangt 's (Train C)

SDAR CP-85-36 Train C Conduits 2 inch and less-(including Junction Boxes)

SDAR CP-85 54 - Seismic Qualifi.ation of HVAC Supports l SCAR CP-87-23 Loose Conduit Unions (including neo-weld, communications and security system conduits)

SDAR CP-87-68 Hilti Bolt Inadequacies ~j l

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TXX-92022 Page 3 of 3 The Unit 2 corrective actions will be completed prior to Unit 2 fuel loading.

Sincerely, William J. Ca ill, Jr.

) h, By:

• Roger D, Walker Manager of Nuclear Licensing JDS/JAA/dc c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (2)

Mr. M. B. Fields, NRR r w ~ ~

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