ML20070M054
| ML20070M054 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 03/14/1991 |
| From: | Woodard J ALABAMA POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| IEB-89-002, IEB-89-2, NUDOCS 9103210032 | |
| Download: ML20070M054 (7) | |
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L March 14, 1991 J, D. V'oodard
/M[t{)illllllMW(T vee r e w S nuc w Farley Proiect the F U"w?O eh frr.Sy W H; Docket-No 50-364 10CTR50.54(f)
U. S. Nuclear Regulatory Commission Attention: Document Control Desk Vashington, D. C.
20555 Gentlement Joseph H. Farley Nuclear Plant - Unit 2 Stress Corrosion Cracking of liigh liardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model S3f9V Sving Check Valves or Valves of Similar Design NRC Bulletin 89-02, " Stress Corrosion Cracking of High-llardness Type 410 Stainless Steel Internal Preloaded Bolting in Anchor Darling Model 5350V Sving Check Valves or Valves of Similar Design," requested addressees to identify, disassemble and inspect certain types of sving check valves t'.at may contein Type 410 stainless steel bolting material of sufficiently high hardness that may be susceptible to stress corrosion cracking.
Alabama Power Company has performed examinations of the bolts used in applicable safety-related sving check valves for Unit 2 during that Unit's seventh refueling outage.
A similar effort is currently being performed for Unit 1 during its tenth refueling outage (currently in progress).
Responses to the specific action items of NRC Bulletin 89-02 for Unit 2 are provided as an attachment to this letter. The Unit I response vill-be submitted within 60 days.of completion of inspection and-testing activities.
Vith the attached action items completed, Alabama Power Company considers this to be a full and complete response to NRC Bulletin 89-02 for Farley Nuclear Plant - Unit 2.
Respectfully submitted, D
u J.'
Voodard Attachment JDV/RFB pgr DK4-13 cc Mr. S. D. Ebneter Mr. S. T. Hoffmar SVORN TO AND SUBSCRIBED BEFORE HE hd/c
,1991
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Attachment Unit 2 Response to NRC Bulletin 89-02 1.
NRC Item All licensees of operating reactors are requested to disassemble and inspect all safety-related Anchor Darling Model S350W swing check valves supplied with internal retaining block studs of As m specificatica A193 Grade B6 Type 410SS.
APCo Response Anchor Darling Model S350W Check Valves are 1500 lb class swing check valves with weld prep ends. The S350N model number designation was used until 1970.
Farley Nuclear Plant does not use Anchor Darling swing check valves of this specific classification.
2.
NRC Item Iicensees should review the design of other safety-related check valves to determine if similar designs and material selection to the Anchor Darling Model S350W are used.
If so, such valves should be similarly inspected.
APCo Response Table 1 lists the Farley Nuclear Plant (Unit 2) safety-related check valves which have a design similar to the Anchor Darling Model S350W valve and have the A193 Grade B6 internal bolting. Valves from this table were disassembled, visually inspected, and the suspect internal bolting replacad with bolting of the same material having a Rockwell hardness of less than Rc26.
3.
NRC' Item Inspection by disassembly should be performed as follows:
1.
If any of the internal bolting is to be reused, it should be inspected for cracks using surface inspection techniques. Cracked bolting shou'.d be replaced and a failure analysis performed including chemical analysis ~to confirm material type.
2.
If all suspect bolting is to be replaced with bolting of material and hardness specified, surface inspection and failure analysis of the_old bolting may not be needed unless an unexpected failure mechanism is evident.
3.
Reused and new bolting should be hardness tested for a maximum Rockwell hardness value of Rc26. Any internal preloaded bolting that does not meet the hardness requirements should be replaced by bolts of the same material with a maximum Rockwell hardness of R::26 or by an alternate material approved by the valve manufacturer.
Attachment Page 2 APCo Response rarley Nuclear Plant replaced all internal preloaded bolting in Unit 2 safety-related check valves which have a design similar to the Anchor Darling Model S350W valves and contained the A193 Grade B6 internal bolting. The bolting was replaced with a similar bolting material that had a maximum hardness of Rc26. As shown on Table 1, no stud degradation was noted upon disassembly. Additional testing was performed on the valve t-studs. No evidence of stress corrosion cracking was aiscovered using liquid penetrant techniques. As a result, no failure analysis was conducted on any studs.
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TABLE 1 NRC BULLETIN 89-02 FARLEY NUCLEAR PLANT UNIT 2 EXAMINATION SCOPE SAFETY-RELATED VALVES i
ITEM VALVE ID #
DESCRIPTION VISUAL INSPECTION NDE TECHNIQUE ANALYSIS FINDINGS USED/RESULTS 1
Q2N23V0007A MDAFWP SUCTION NO DEFECTS OBSERVED LIQUID PENr;n< ANT N/A NO DEFECTS FOUND FROM CST 2
Q2N23V0007B MDAFWP SUCTION NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND FROM CST 3
Q2P1tGV0075 SW TO RCP MTR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND CLR CTMT ISO 6
Q2P17V0083 CCW _ PPLY TO NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND RCP 1
5 Q2P17V0159 CCW SUPPLY TO NO DEFECTS OBSERVED LIQUID PENr;fRANT N/A NO DEFECTS FOUND EXCESS LETDOWN HX 6
Q2P16V0070A SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENEfRANT N/A NO DEFECTS FOUND HEADER 7
Q2P16V0070B SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND HEADER 8
Q2P16V0069A
. AUX BLDG SW NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND DISCHARGE j
i 9
Q2P16V0069B AUX BLDG SW NO DEFECTS OBSERVED LIQUID PENETRANT N/A l
NO DEFECTS FOUND DISCHARGE
TABLE 1 NRC BULLETIN 89-02 FARLEY NUCLEAR PLANT UNIT 2 EXAMINATION SCOPE SAFETY-RELATED VALVES ITEM VALVE ID #
DESCRIPTION VISUAL INSPECTION NDE TECHNIQUE ANALYSIS FINDINGS USED/RESULTS 10 Q2N23VOOO6 TDAFWP SUCTION NO DEFECTS OBSERVED LIQUID PENtrxANT N/A 4
NO DEFECTS FOUND FROM CST 11 Q2P17V0001A CCW PUMP NO DEFECTS OBSERVED LIQUID PENurxANT N/A NO DEFECTS FOUND DISCHARGE 12 Q2P17V0001B CCW PUMP NO DEFECTS OBSERVED LIQUID PENurKANT N/A NO DEFECTS FOUND DISCHARGE 13 Q2P17V0001C CCW PUMP NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND DISCHARGE 14 Q2P16V0564 DG TRN B SW NO DEFECTS OBSERVED LIQUID PENERTANT N/A NO DEFECTS FOUND SUPPLY 15 Q2P16V0565 DG TRN A SW NO DEFECTS OBSERVED LIQUID PENtrxANT N/A NO DEFECTS FOUND SUPPLY 16 Q2P16V0552 SW PUMP NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND DISCHARGE 17 Q2P16V0553 SW PUMP NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND DISCHARGE l
18 Q2P16V0554 SW PUMP NO DEFECTS ABSERVED LIQUID PENurxANT N/A NO DEFECTS FOUND DISCHA.RGE l
TABLE 1
'NRC BULLETIN 89-02 FARLEY NUCLEAR PLANT UNIT 2 EXAMINATION SCOPE SAFETY-RELATED VALVES ITEM VALVE ID #
DESCRIPTION VISUAL INSPECTION NDE TECHNIQUE ANALYSIS FINDINGS USED/RESULTS 19 Q2P16V0555 SW PUMP NO DEFECTS OBSERVED LIQUID PENETRANT N/A DISCHARGE NO DEFECTS FOUND 20 Q2P16V0556 SW PUMP NO DEFECTS OBSERVED LIQUID PENETRANT N/A
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DISCHARGE NO DEFECTS FOUND 21 Q2P16V0206A SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND 22 Q2P16V0206B SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND l
23 Q2P16V0206C SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND 24 Q2P16V0206D SW TO CTMT CLR NO DEFECTS OBSERVED LIQUID PENETRANT N/A NO DEFECTS FOUND 25 Q2N11V0001A MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A I
l 26 Q2N11V0001B MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A 27 Q2N11V0001C MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A 28 Q2N11V0002A MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A 29 Q2N11V0002B MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A 30 Q2N11V0002C MSIV NO DEFECTS OBSERVED NOT EVALUATED N/A
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.NRC.l BULLETIN'89-02
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FARLEY. NUCLEAR-PLANT' UNIT 2-EXAMINATION SCOPE
^ SAFETY-RELATED VALVES-ITEM VALVE ID #'
DE' MPTION VISUAL INSPECTION-NDE TECHNIQUE ANALYSIS FINDINGS' USED/RESULTS' 31 Q2P16V063SA SW BOOSTER PUMP.
NO. DEFECTS OBSERVED-LIQUID PENETRANT N/A:
OUTLET NO-DEFECTS FOUND' 32 Q2P16V0635B SW BOOSTER PUMP NO DEFECTS OBSERVED LIQUID: PENETRANT N/A OUTLET NO DEFECTS FOUND 33 Q2P16V0636A SW.A-TRN. CYCLONE
'NO DEFECTS OBSERVED-LIQUID PENETRANT N/A SEPARATOR. OUTLET NO DEFECTS FOUND 34 Q2P16VO636B SW B TRN CYCIDNE NO DEFECTS OBSERVED LIQUID PENETRANT N/A SEPARATOR OUTLET NO DEFECTS FOUND l
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