ML20083D762

Suppl Deficiency Rept CP-85-029 Re nonseismic-to-seismic Interaction Effects in Design of Architectural Features. Initially Reported on 850813.Design Mods Will Be Implemented Prior to Fuel Load

ML20083D762
Person / Time
Site:	Comanche Peak
Issue date:	09/24/1991
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CP-85-029, CP-85-29, TXX-91283, NUDOCS 9110010225
Download: ML20083D762 (2)

Text

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Log # TXX 91283

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.- C File # 10110 Z C 903.8 7UELEC7RIC Ref. # 10CFR50.55(e)

Septerber 24 1991 Williers J. Cahill. Jr, Iwvrove nre hrsulent U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington D. C. 20555 l

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) UNIT 2 DOCVET NO. 00 446 DESIGN OF ARCH 11ECTURAL TEATURES SDAR CP 85 029 (SUPPLEMENTAL REPORT)

Ref: 1) TV Electric letter from W. G. Council to .

NRC dated Februarv 4, 1488. TXX-88171 (Final Rekrt) I

2) NRC letter to TV Electric rhted September 18, 1984

3) TU Electr;c letter from William J. Cahill Jr. to NRC dated August 14, 1989. TXX 89563 (Supplemental Report)

4) TU Electric letter from William J. Cah111 dr.. to NRC dated April 23. 1991. TXX 91164

5) 10 Electric letter from W. G. Council to NRC dated February 5. 1988. TXX 88204 (Supplemental Report)

(SDAR CP 86-012)

6) 1U Electric letter from William J. Cahill Jr. to NRC dated June 14, 1991. TXX 91222 (Supplemental Report)

(SDAR CP-87-062)

Gentlemen:

On August 13, 1985, TV Electric orally notified the NRC of a deficiency involving non-seisinic to seismic interaction effects in the design of architectural features. As ludicated in reference 1, Dsne Specific Action Plan (ISAP) II.d of the Comanche Peak Response Team (CPai: Program Plan addressed technical icsues and allegations transmitted i; TV Electric by the NRC concerning non-seismically designed ceiling elements installed in the control room. As part of their findings, the NRC's letter (Reference 2) required TU Electric to provide the results of an analysis which demonstrates tl:at structural f ailures of other Category 11 and non-seismic structures, systems and components are reviewed for the effect of failure on safety 1 related structures, systems and components. In Reference 3, TV Electric indicated that the corrective action for Unit 2 will be assessed after the resumption of Unit 2 engineeritig activities. This letter provides the Unit 2 corrective actions for this deficiency.

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/ gDy) 9110010225 91o924 s l b

{llR ADOCR 0300 6 400 Nonh Olive Street 1.11. si Daua. Tem 15201

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IXX 91283 a Page 2 of 2 br.citilegt ut4Lff eturCl Certain existing architectural features do not require further Unit 2 actions since the Unit 1 evaluations corrected or enveloped Unit 2. These include: I doors, sheet rock walls, acoustical blants (control room ceiling), and l fiberglass overlay sheets icontrol room). 1 l

The existing design of gratings, checkered plates, ladders, handrails and anchorages of miscellaneous structural items are being evaluated for seismic adequacy, Where required, design modifications will be implemented prior to Unit 2 fuel load.

Reference 4 discussed the methodology to be utilized for the physical validation of new and modified Seismic Category 11 installations. The same methodology is being used for the physical validation of existing Seismic Category 11 installations as prescribed by engineering for the commodities listed above.

The remaining architectural features such as lighting, speakers, horns, smoke detectors, and miscellaneous architectural elements such as flushings/ trims will be addressed in a future letter describing the corrective actions fee 50AR CP 86 045 " Seismic Category !! Systems and Components".

N o n A r cAi i g tigt.a 1 E g qip mx n t2.Jingqi u ngi_gtLgam p_gantt i The following non architectural items are not included in the scope of this SDAR since they are addressed in other SDAR's a) Relative building motion and commodities attached to secondary walls have been addressed in SDAR CP-06 012 " Commodity Installations at Secondary Wall Gaps" (see Reference 5),

b) The design of Class 5 piping and supports have been addressed in SDAR CP 87-62 " Class 5 Piping" (see Reference 6),

c) Train C junctica boxes will be addressed in a future letter describing the corrective actions for SDAR-CP-86-045 " Seismic Category !! bystems and Components".

Sincerely,

/,

i W 111am J. C d 1 Jr, l CBC/rjb cc Mr. R. D. Martin, Region IV Resident inspectors, CPSES (2)

Mr. M. B. Fields, NRR l

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