ML20005H087
| ML20005H087 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 01/17/1990 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-002, IEB-89-2, NUDOCS 9001240127 | |
| Download: ML20005H087 (3) | |
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TENNESSEE VALLEY: A U T H O R'I T Y y
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U.S!: Nuclear-Regulatory Commission' d
' ATTN:?, Document-Control Desk'
- Washington, D.C.
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n Gentlemen :
g In'the' Matter of.
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Docket Nos. 50-259,
! Tennessee Valley'Authorityf
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50-260-y 50-296 Wim NO ~
2 BROWNS FERRY NUCLEAR PLANT (BFN) - RESPONSE TO NRC BULLETIN (NRCB) 89.= STRESS CORROSION CRACKING 0F HIGH-HARDNESS TYPE 410' STAINLESS STEEL; INTERNAL U
i oPRELOADED BOLTING ~IN< ANCHOR DARLING MODEL S350W SWING CHECK VALVES OR VALVES OF SIMILAR DESIGN!
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' Bulletin'89-02! requests licensees identify, disassemble, and= inspect Anchor
-Darling Model S350W swing' check valves and/or swing check valves of a similar
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- design which.contain' type 410 stainless steel preloaded bolting material. BFN-a
- performed a thorough, review'of.its. safety-related check valves.- The results-
'ofithis review. indicate that BFN does not have any check valves in its safety-related-systems within the scope of NRCB.89-02. Enclosed is a description of how'BFN conducted its review and the results.
'If?you haveLany. questions on this matter,-please telephone Patrick P. Carier,,
.BFN, (205) 729-3570.
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'Very truly yours, y
TENNESSEE VALLEY AUTHORITY h
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Manager, Nuc air Licensing i
and Regulatory Affairs j
Enclosure
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9001240127 900117
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gDR ADOCK 05000259
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,e ggiU.S." Nuclear Regulatory Commission oe
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= E Ms. S;-C.' Black, Assistant Director for. Projects TVA Projects Division l
U.S.. Nuclear Regulatory-Commission-One White Flint, North l
'I 11555 Rockville Pike Rockville,. Maryland 20852 g
I Mr.
B.-A. Wilson, Assistant Director i
for. Inspection Programs TVA Projects Division U.S~: Nuclear Regulatory, Commission p
Region II.
101 Marietta Street, NW, Suite 2900 Atlanta, Georgia-30323 NRC Resident' Inspector-Browns' Ferry: Nuclear Plant Route 12,' Box:637 Athens,LAlabama 35609-2000 i
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Enclosure V
BROWNS FERRY NUCLEAR PLANT Response-to NRC Bulletin (NRCB) 89-02 The following is a.brief discussion of the methodology used in making the determination that there are no Anchor Darling model S350W swing check valves or valves of similar design that are subject to stress corrosion cracking as
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described'in NRCB 89-02 used at TVA's BFN:
BFN's MechanicalLEngineering section in conjunction.with the Plant
'i Maintenance section. reviewed the safety related check valves found cut the "Q-list" (Quality assurance list). The Q-list is a formal quality assurance
.I document containing-a list of safety related items including safety related check valves. The review of the Q-list indicated that'BFN had approximately
'1400 safety related check valves. This list was supplemented by using maintenance history-files on the check valves, Design Baseline Verification Program walkdown.information, ISI Section XI Pump and Valve program
-information,' and vandor contract files, j
This" valve.information was then further categorized by type of check valve, size, vendor, manufacturer's model or type,'and system. BFN then proceeded -
to eliminate the check valves that were not' included within the scope of NRCB 89-02 by applying the following criteria:
1.-
Iyng There are numerous check valve types and body configurations with many adaptations or versions of each..Those types which were considered outside the scope of NRCB 89-02 were eliminated, such as ball, piston
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lift,-tilting disc,. folding disc, in-line check, and stop check. An i
example of this vould be the approximate 900 check valves that were l
' omitted because they were ball type lift check valves. These valves l
would not.contain the hinge block preloaded bolting.
2.
Manufacturer The Nuclear Management and Resources Council (NUMARC) has conducted an
' industrial survey of valve manufacturers in order to identify other check valves which would fall under the scope of NRCB 89-02.
Those manufacturers that responded indicating that they had not supplied safety-related check valves using type 410SS internal bolting, were t
excluded from the scope (i.e, Kerotest, Borg-Warner, etc.).
The remaining check valves on the 1ist were given a final review. This review consisted of examining manufacturer's catalog information for the applicable types and models or vendor drawings in order to determine if they had similar internal design characteristics as the Anchor Darling model S350W.
After the completion of this process it was concluded that there are no Anchor Darling model S350W swing check valve or similar designed checks valve, using type 410SS bolting on disc retaining block (within the scope of
'NRCB 89-02) in use at BFN.
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