TXX-6644, Interim Deficiency Rept CP-87-44 Re Unistrut Tubing Support Bolting.Initially Reported on 870717.Further Evaluation of Conditions Required.Next Rept Will Be Submitted by 871023
| ML20237K546 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 08/17/1987 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-87-44, TXX-6644, NUDOCS 8708190304 | |
| Download: ML20237K546 (1) | |
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Log f TXX-6644 File # 10110 t
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TUELECTRIC William G. Coun3ll E2nuthe %cc Preukne U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D. C.
20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 i
UNISTRUT TU8ING SUPPORT BOLTING SOAR: CP-87-44 (INTERIM REPORT)
Gentlemen:
On July 17, 1987, we verbally notified your Mr. Ian Barnes of a deficiency involving Specification CPES-I-1018 (Installation of Piping / Tubing and Instrumentation) which allows the use of either ASTM A-307, Grade A or 8 or SAE J-429, Grade 1 or 2 bolting in tubing supports.
This is an interim report of a potentially reportable item under the provisions of 10CFR50.55(e).
The majority of safety-related tubing supports are fabricated, utilizing typical unistrut members and joint configurations.
Unistrut catalog 10R (dated 1986) requires the use of SAE J-429 Grade 2 bolts.
The torquing requirements specified by unistrut for SAE J-429, Grade 2 bolts results in a tensile stress wh'ch could cause " permanent set" resulting in unpredictable i
clamping force and unknown load limits.
Further evaluation of these conditions is required.
We anticipate submitting our next report on this issue no later than October 23, 1987.
Very truly yours, 145
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' i, Manager, Nuclear l'igdsing DAR/gj T
c - Mr. R. D. Martin, Region IV Hesident Inspectors, CPSES (3) 8708190304 Q U[DR 45 l
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nw North ouve Street LB 81 Dallas, Tew 7201 Q
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