ML20207K727
| ML20207K727 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 12/18/1986 |
| From: | Griffith J TENNESSEE VALLEY AUTHORITY |
| To: | |
| Shared Package | |
| ML20207K578 | List: |
| References | |
| 232.8(B), 232.8(B)-R, 232.8(B)-R00, NUDOCS 8701090500 | |
| Download: ML20207K727 (4) | |
Text
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TVA EMPLOYEE CONCERNS REPORT NUMBER: 232.8(B)
SPECIAL PROGRAM REPORT TYPE:
SEQUOYAH ELEMENT REVISION NUM8ER: 0
(- -
NON-RESTART JUSTIFICATION
SUMMARY
TITLE:
PIPING AND VALVE DESIGN Criteria for Minimum Pipe Wall Thickness PAGE 1 0F 2 REASON FOR REVISION:
PREPARATION PREPARED BY-Y
~ ~ SIGNATURE 10-27-86 hi
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DATE REVIEWS fRe#r EVIEW COMMITTEE sh__-A
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l S Sb SIGNATURE DATE CONCURRENCES 8701 P"090500861222 ^
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SIGNATtjRT/
DATE APPROVED B,Y f,
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l$*l$'$h N/A ECSP MANAGER DATE MANAGER OF NUCLEAR POWER DATE CONCURRENCE (FINAL REPORT ONLY)
- SRP Secretary's signature denotes SRP concurrences are in files.
10/17/86 - 02560
t 1
SEQUOYAH NUCLEAR PLANT ENGINEERING RELATED EMPLOYEE CONCERNS j
1 SPECIAL PROGRAM NON-RESTART JUSTIFICATION
SUMMARY
SUBCATEGORY / ELEMENT 232.8(B)
The concern is not valid for the SQN Plant based on the following findings:
SQN piping was designed to the ANSI B31.1 Power Piping Code (Reference; SQN FSAR Chapter 3).
The commitment to the ASME Section III code applies to piping items initially procured after April 2, 1973.
The WBN Plant Design Criteria (WB-DC-40-36) issued originally 2/11/75, invokes the ASME B&PV Code,Section III for the determination of minimum required pipe wall thickness of ASME Class 1 and 2 stainless steel piping.
There is no evidence to support the allegation stated in the concern that TVA Engineering Design established in 1978 a minimum required pipe wall thickness criteria more stringent than the ASME Code.
The concern appears related to the maximum manufacturing tolerance of
(-) 121/2% of the nominal pipe wall thickness allowed by ASTM Standard n
Specification A530 ( ASME SA-530) for seamless and welded piping procured U
under a number of ASTM pipe product specifications.
This manufacturing tolerance is a maximum and the purchaser may specify a smaller tolerance if available from the supplier. A different manufacturing tolerance has no impact on the conservatism of pipe wall thickness required since the installed pipe must have an actual _ (measured) minimum wall thickness equal to or greater than the r_e_ quired minimum wall thickness calculated by the ASME Code formula.
There is no inference in the concern that ASME Class 1 and 2 stainless steel piping at WBN is unsafe as a consequence of using the code formula for determination of minimum required pipe wall thickness.
Similarly th*ere is no concern for diminution of safety at SQN as a consequence of having used the ANSI Power Piping Code for determination of minimum required pipe wall thickness in safety related systems utilizing stainless steel pipe.
ATTACHMENT:
List of Issues for Mechanica_1 ELEMENT NO.
232.8(B)
Date:
09/21/86 G
02560 - Page 2
r_-______.____
w t
LIST OF ECHAN!rAL ISSUES
-.E.E..NT N_ UMBER.232.8 BY:
J. S. Gri f fith EL SCu_.RE START.. NO ELEENT W(RE RESPON-ConCtan MPeta(S)
!$5UES ADDRESSED SIBLE GENERAL APPRDACH/ METHODOLOGY FOR ELEENT REPORT 15-ES-M S-YOL 1.
The A54 Section !!! cede formula JG 1.
Review app 1tcatic TV4 engineering design 10-1/75 was the criteria esta-for calculatine required minimum criteria for ASPT Section !!! Class I and 2 blished ty Engineer Design for wall thichness of stainless steel stainless steel pipine established for WN and minimum wall thickness since Class 1 and 2 ASME piping may be SON.
1978. Cne engineer was found less conservative than the 12-1/21 to Le usin5 the less stringent criterion established for hCN units
?.
Review aprif catie ASME MPY Code, Section 1!!,
formula contained in Code 1 and 2 in 1978.
for minimum wall thickness calculation require-me nts.
Section NS. The ateve applies to CA Class 2. and sone Class 1, 3.
Review SQN FSAR sections pertaining to pipiny stainless steel pipe in Units classification and desi et.
t I & 2.
Construction department Cor:Cern. Cl has no further 4
Review typical pipe wall thickness calculatien f r formatien.
to veri fy conformance with design criteria.
0;!1-18
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- --- CEFERENCE '~ ECPS12OJ-ECPSIZIC--
~
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'-~ ' TENNESSEE VALLEY AUTHORITY PAGE 130-FRE90ENCY
- REGUEST-
- - = - -
- OFFICE OF NUCLEAR PONER RUN TIME - 12:57:19 O
ONP - ISSS.- C,_-
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~EDFLOYEE CONCERN PROGRAM SYSTEM (ECPS)
RUN DATE - 12/02/86 I
LIST OF EIFLOYEE CDPCERN INFORMATION CATEGORY: EN DES PROCESS & OUTPUT SUBCATEGORY: 23284 PIPING MALL THICKNESS TOLERANCE
.a H
APPL STC/NSRS P
KEYHORD 8 CONCERN SUS R PLT B B-S N - INVESTIGATION S
CONCERN KEYHORD C
" " " " * " - - *^' ~ CAT. D LOC-F_L 4 3-REPORT R
DESCRIPTION KEYHORD D O
IN 545-X86-EN-23288 N NSN Y Y-Y-Y-SR 12 I/2% MAS THE CRITERIA ESTABLISNED NONCONFORMANCE T54225
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- REPORT SY ENGINEER DESIGN FOR MINIMUM HALL STANDARDS O
THICKNESS SINCE 1978. ONE ENGINEER ENGINEERING uAS FOUNs 10 sE uSING THE LESS PIFE
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100ENT FORMULA CONTAINED IN CODE,STRI SECT ION NB.
THE ABOVE APPLIES TO GA CLA
$$ 2, AND SOME CLASS 1, STAINLESS ST O
EEt RIPE IN UNITS I a 2.
CONSTRuCTI ON DEPARTMENT CONCERN. CI HAS NO FU O
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RTHER INFORMATION. NO FOLLON UP REG t
I CONCERNS FOR CATEGORY EN SUSCATEGORY 23208 lO T
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