ML20198E699
| ML20198E699 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs, 05000000 |
| Issue date: | 05/08/1986 |
| From: | Jaffe D Office of Nuclear Reactor Regulation |
| To: | Harold Denton, Eisenhut D, Thompson H NRC |
| Shared Package | |
| ML20151L176 | List: |
| References | |
| FOIA-86-266 NUDOCS 8605280195 | |
| Download: ML20198E699 (27) | |
Text
{{#Wiki_filter:_ o,, UNITED STATES [ p, NUCLEAR REGULATORY COMMISSION ; 3 p WASHINGTON, D. C. 20555 1
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Docket No. 50-3I8 sh\@ MEMORANDUM'FOR: H. Denton J. Lyons D. Eisenhut T. Speis H. Thompson J. Knight
's F. Miraglia R. Bernero A T. Novak G. Holahan G. Lainas D. Vassallo D. Crutchfield J. Stolz J. Zwolinski S..Varga B. Snyder -
THRU: Ashok C. Thadani, Director PWR Project Directorate (8 < FROM: David H. Jaffe, Project Manager PWR Project Directorate #8
SUBJECT:
DAILY HIGHLIGHT - CALVERT CLIFFS ~ ' UNIT 2 MAIN STEAM SAFETY VALVES A meeting will be held in AR 2242 on November 26,1985 at 9:00 A.M. with Baltimore Gas and. Electric. The purpose of the meeting will be to discuss the return to service of Calvert Cliffs Unit 2 in light of recent main steam safety valve setpoint problems. I ( hu b g l vid H J fe.f ject Manager ' PWR Pro t Directorate #8. l i e e
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8605280195 860506 PDR FOIA ) MURPHYB6-266 PDP. I p . 4/# i
.. ~ . - . AGENDA U-1 -
. Past Test Results ,
. Estimated Current Condition of Valves
. Conclusions
. Future Actions .
6 e e E
MSSV UNIT 1 LIFT SETPOINT TEST (AS FOUND/AS LEFT PSIG) As Lef t Setpoint Hydroset Test Hydroset Test Hydroset Test Valve (!!% PSIG) Oct.11,1983 April,1985 June,1985 4 3992 985 959/975 9)3 3993 985 975/988 3994 995 995/995 V 3995 995 987/987 990 3996 1015 989/1024 1024/1024 V 3997 1015 1014/1014 3998 1035 1023/1028 4 3999 1035 1010/1034 4000 , 985 990/9'90 980/980 978 983 4001 985 981/981 964/983 4002 995 961/996 990 4003 995 987/987 999 4004 1015 1024/1024 1016 4005:- 1015 986/1010 1012 4006 1035 1058/1040 1030 4007 1035 1043/1043 Test Results: 1 Low 6 Low 1 High 0 High 3 Sat 8 Sat e mssvul o O f e
U-l CONCLUSIONS Valves will open, provide full capacitp,
. and reset as designed.
No safety implications e 6
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- FUTURE ACTIONS Verify setpoints of all 16 valves during next outage. -
pg
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Reset any valves outside 3,1% If necessary to reset any valve, verify setpoint of valves during first outage after 3 months operation. e e O e e n
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AGENDA U-2
. Describe Safety Valves
. Describe As-Found Results
. Results of Safety Analysis
. Outline Test Program
. Test Program Results
. Conclusions
. Future Actions u2 agenda l
I l 1
STEAM GENERATOR #22 M MMl l 4002 1 1 \ ; 1 l i i hNt 4003 N* ) 4005 ( ) 4007 g )
*M8/p STEAM GENERATOR #21 3994 3998
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RtF g9 gry NoutNCLATURf I 8ASE ASSEMBLY 8A - h C 10 ASE STUD Mi L { 19 10 10 BASE STUD NUT h-{7
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U y 2 1 YOKE 2 73 4 / ;b 1 3 2 YOKE ROD 7 g Ah [". 3A L COVER PLATE 78 ) p-4 5 4 YOKE ROD NUT (NOT SHOWru DISC 70 1
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'- P M 6 SPRING ASSEMBLY 6A 6A 1 TOP SPRING WASHER
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- g. / 6C 1 SPRING 7 1 COMPRESSION SCREW 18 7A I COMPRESSION SCREW LOCKNUT 78 i COMPRESSION SCREW ADAPIOR 7C 1 THRUST BEARING 3
8 1 SPINDLE 9 1 UPPER ADJ. RING 3A 3 , 68 10 1 LOWER ADJ. RING y t f'/j'MW// 11 I UPPER RING PIN
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f-4_ llA 1 LOWER RING PIN I W/- 10 12 1 DISC HOLDER y - gyp h' 13 1 DISC COLLAR . 5
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13A 1 DISC COLLAR COTTER PIN 9 ? b: j 13A 14 1 GUIDE 11 ._. ___ 15 'l CAP llA &Jl 15A 1 CAP SET SCREW L, 18
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16A 1 RELEASE NUT COTTER PIN -
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1 MSSV UNIT 2 LIFT SETPOINT TEST . (AS FOUND/AS LEFT PSIG) As Found With
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Setpoint Hydroset .l Valve (t 1% PSIG) Oct.1982 Apr.1984 Oct.1985 Correction 3992 985 1009/982 991/991 987 3993 985 963/975 1015/985 1011 3994 995 1022/996 1001/1001 997 3995 995 962/989 1035/1004 1031 3996 1015 1021/1021 1037/1006 1024/1024 1020 3997 1015 1015/1015 1044/1008 1020/1020 1016 3998 1035 929/103546
~ 1065/1038 1044/1044 1040 3999 1035 1032/1032 1053/1038 1057/1038 1053 ~
4000 985 974/981 1037/993 1033 4001 985 987/987 972/985 1040/992 1036 4002 995 998/998 1004/1004 1059/993 1055 4003 995 996/996 1014/990 1047/997 1043
, 4004 1015 1018/1018 1070/1018 1065
. 4005 1015 1012/1012 1054/1018 1050 l 4006 1035 991/1036 1104/1035 1100
; 4007 1035 980/1034 1106/1039 1102 , Test Results: 1 Low 6 Low 0 Low 0 Low 0 High 7 High 11 High 11 High 6 Sat 3 Sat 5 Sat 5 Sat i
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a.
. ACCIDENTS PREDICTING MSSV OPERATION
. Loss of Load
. Loss of Load to One Steam Generator
. CEA Withdrawal
. Feed Line Break
. Lossof Non-Emergency AC Power
. . Loss of Feedwater
. Small Break LOCA 6
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MAIN STEAM SAFETY VALVE SAFETY ANALYSIS, Nominal As-Found As-Found UIC8* i Setpoint Setpoint Analysis Analysis PSIG PSIG PSIG PSIG RV-3992/4000 985 991/1037 1037/1037 1035** RV-3993/4001 985 1015/1040 1040/1040 1035** RY-3994/4002 995 1001/1059 1059/1059 1935 . i RV-3995/4003 995 1035/1047 1047/1047 1035 t EV-3996/4004 1015 1024/1070 1070/1070 1065 i RV-3997/4005 1015 1020/1054 1054/1054 1065 _ RV-3998/4006 1035 1044/1104 1104/1104+ 1065
~
RY-3999/4007 1035 1057/1106 1106/1106+ 1065 i
- This configuration has been shown to be applicable for U2C6.
** Small Break LOCA ==memes 995 PSIG.
+ RV-4006 and RV-4307 were assumed stuck alamed for Loss of Load analysis.
RY-3998 and RV-3999 opened at 991 and 1001 PSIG, respectively. o . S
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1 fu (e.V C ed ed l - l l l MAIN STEAM SAFETY VALVE SAFETY ANALYSIS l Nominal As-Found As-Found UIC8* Setpoint Setpoint Analysis Analysis PSIG PSIG PSIG PSIG RV-3992/4000 985 991/1037 1035 1037/1037 RV-3993/4001 985 1015/1040 1035 1040/1040 l 1 RV-3994/4002 995 1001/1059 1935 1059/1059 RV-3995/4003 995 1035/1047 1035 1047/1047 RV-3996/4004 1015 1024/1070 1065 1070/1070 RV-3997/4005 1015 1020/1054 1065 1054/1054 RY-3998/4006 1035 1044/1104 1065 1104/1104+ l RV-3999/4007 1035 1057/1106 1065 1106/1106+
- This configuration has been shown to be applicable for U2C6.
** Small Break LOCA assumes 995 PSIA.
+ RV-4006 and RV-4007 were assened stuck h for Loss of Imed analysis.
RV-3998 and RV-3999 opened at 991 and 1001 PSIG, respectively. 1 i O e w.,7, -,m.w..my.-,,-.-97,.y---g+ y.cw.vy--. ..--,-+y-py,+ ,-vwi--w-,-,-v.,,--or-=-* ww+-w--+------- =v--*
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m ( RESULTS SMALL BJLEAK LOCA l
. Available High Pressure Safety Injettion flow is higher than assumed in Mysis.
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. Higher flow compensates for higher MSSV setpohits.
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l NON-LOCA SAFETY ANALYSB IJMITING EVENTS
. Loss of Load
. Loss of Load to one steam generator LDmTNG PARAMETER
. Pm secondary system preseren Limit less than 1100 PSIA.
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n RESULTS NON-LOCA SAFETY ANALYSIS LOSS OF LOAD TO ONE STEAM GENERATOR
. As-found setpoints used
. Otherwise identical to UIC8 analysis
. Peak secondary system pressure = 1080 pain LOSS OF LOAD
. As-foted setpoints used
. KFC = 0.0E-4 delta rho /F vs. +0.7E-4 delta rho /P (U1C8)
. Otherwise identical to UIC8 analysis
. Peak secondary system pressure = 1093 psia W
4
MSSV TESTING PROGRAM RV-3993
- 1. At 700F ambient,500 F steam
- a. Thermal equilibrium
- b. Test set pressure .
- c. Full Flow Test
- d. Checkleakage
- e. Retest set pressure.
- 2. At 700F ambient,530 F steam, repeat la - e.
- 3. Heat up transient at 1200 F ambient,5300F steam prior to thermal equilibrium, repeat Ib - d.
~
- 4. Heat up to thermal equilibrium at 120 F ambient,530 F steam, repeat Ib - e.
- 5. Set with new hydroset, check with old hydroset at 985,995,1015, and 1035 psig.
- 6. Reset to 985 psig at 1200 F ambient and 5300 F steam, repeat Ib - e and check with 2 full flow tests.
2-RV-3992
- 1. At 120 F ambient,530 F steam
- a. Thermal equilibrium
- b. Test set pressure
- c. Full Flow Test
- d. Checkleakage
- e. Retest set pressure NOTEi For all tests, record value of temperature vs. time for inlet nozzle, body, spring, and outlet flange.
2RV e l S l l l
Wyle Test Valve BM-7771 11/12 - 14/85
- 1. Valve Set at 985 + 10 Ambient - Avg. 86.30F System - Avg. 495.5 F Hydroset - Avg. 975.6 psi set pressure
. Full Flow - Avg. 986.3 psi pop pressure
- 2. Ambient - Avg. 74.60F System - Avg. 537.70F Hydroset - Avg. 966.3 psi set pressure Full Flow - Avg. 979 psi pop pressure
- 3. Ambient - Avg.119.80F 1 hr. heat up System - Avg. 526.2 F Hydroset - Avg. 973.8 psi Full Flow - Avg. 979 psi 0
- 4. Ambient - Avg.118.3 F 4 hr. heat up System - Avg.527 F Hydroset - Avg. 965.8 psi set pressure Full Flow - Avg. 976 psi pop pressure
- 5. Valve set at 1035 1 10 Ambient - Avg.119.50F
. System - Avg. 527.5 F -
Hydroset - Avg.1035.6 psi set pressure Full Flow - Avg.1030.5 pop pressure
- 6. Valve Reset at 9851 10 Ambient - Avg.1190F System - Avg. 523.50 F ,
Hydroset - Avg. 967.5 psi set pressure Full Flow - Avg. 981.3 psi pop pressure
- 7. Wyle Test Valve BM 7787 - 11/14/85 -
Ambient - Avg.122.70F System - Avg. 323 F Hydroset - Avg. 966.3 psi set pressure Full Flow - Avg. 984.5 psi pop pressure wyle i
. I
1985 Ring Setting Stem Avg. Disk Maximum
- As Found
, Valve Top Bottom Surface Run Out to Guide Set Pressure Set Pressure 2-RV (Note 2) Film /Cond. (Note 1) Clearance ** (PSIG) (PSIG) 3992 -7t -2 very light / good OK 19t '995 987 3993 +22t +12 very light / good OK 17t 995 1011 3994 113t -15 very light / good 8t 18t 1005 997 3995 6t -2 very light /some wear OK 15t 1005 1031 3996 -Ilt -3 very light / good 15t 15t 1025 1020 3997- 12t -2 very light / good 8t 13t 1025 1016 I 3998 13t -
J heavy / good 10t 14t 1045 1040 4 3999 -7t -1 J heavy / good 24t 13t 1045 1053 4000 4t -9 very light / good 21t 14t 995 1033 J 4001 12t -l J heavy / good 14t 14t 995 1036 4002 95t -3 very light / good , 10t 14t 1005 1055 4 4003 12t -7 / heavy / good 13t 13t 1005 1043 4004 25t -3 very light / good 29t 11t 1025 1065 4005 52t -3 very light / good 20t 15t 1025 1050 4006 27t -1 very light / good 13t 13t 1045 1100 4007 22t -1 very light / good 18t 12t 1045 1102 8 pel""** $* /6a p ~1 g &* W
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2 t = 10-3 inches ocMin. old disic to guide clearance 10t 03 Min. new disk to guide clearance 15t
- 1. No effect below 0.0625"
- 2. As-Found ring positions affect setpoint by less than 1% and yield 15% or less blowdown.
9 1
. ~ . -
U-2 CONCLUSIONS Apparent setpoint chinges not explained by as-found condition of valves. , Apparent setpoint changes may possibly be the result of measurement technique. Rebuilt valves will perform as designed. C e a
e a U-2 . FUTURE ACTIONS Procedural Enhancements
~
Set valves at 530 F vice 500 F Provide QC coverage while verifying setpoints Independently reverify setpoints of 4 valves 12 hours after initial setting. Verify setpoints of 4 valves during first outage after 4 month operation.
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.. REVISED NC 7512 Safety Valve Operating Requirements NC-7512 Safety Valve Operating Requirements NC-7512.1 Antichattering ~and Lift' Requirements. NC.7512.1 Ant! chattering and L!ft Require nents.
Safety valves shall be constnicted to operate without chattering and to attain rated lift at a pressure not greater than 3% above their set pressures. (a) Safety valves shall be constructed and adjusted to operate withotit.
'# , "f"/lgghatteringandtoattainr4.Pi lift I Itapressurenotgreaterthan3Y.[
above their set p,ressures nr,,. 4-+h M,A m (b) For.vaives ug +for main stisam .nf4.A
/ /' service, conformance with (a) aheda %
shall.be. established for each produc-tion valve bs fe!' % tMwrg.c s.beem- The. test shall take into. account valve E':t ,iL:t; presc =
-leseet and discharge piping ,back pressure as specified in the valve Design Specification, NC-7512.2 Opening l>ressure Tolerance ,
(a) The opening pressure tolerance plus or minus shall not exceed the following: 2 psi for pressures up to and including 70 psi, 3% for pressures over 70 psi to 300 psi,10 psi for pressures over 300 psi to 1000 psi,
- and 1% for pressures over 1000 psi.
'(b) Conformance with the requirements of(a) above shill be established for each production valve by test.
Steam valves shall be tested on steam. NC.7512.3 Blowdown Requirements. Safety valves , shall be adjusted to close after blowing down to a NC 7512.3 Blowdown Requireme'ats. pressure not lower than that specified in the valve (a) < . Design Specification. ' Die adjustment sha!! be deter- . ~ Safety valves ; mined by test or by proration from the Certificate shall be adjusted to close after blowing down to a ; H:Idtr's blowdown test data. pressure.not lower thanythat speci8ed.in(the valve Design.SpeciSStion;7g -) - p I q..: , ,. : . t 2.u p aQwat, (b) Fo valves used for. main steam servicn. c nformance with (a) awe shall.be e tabiished for each production valve byrful' n o. tem 4agda steam. The
' ' test shall take into account valve T :t pr : = c ':::c:.and discharge piping back ressure as specified in the valve Design,_ Specification.
(c) eFor valves used for:other than main steam service, the adjustment shall be determined by test for proration from the Certificate Holder's blow. down test data. gg
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' V EnsT/M6 RE V /SE b
. . . . . , . s NC 7512 Safety Valve Operating Requirements NC-7512 Safety Valve Operating Requirements NC-7512.1 Antichattering and Lift Requirements. NC-7512.1 Antichattering and I' ' Requirements.
Safety valves shall be constructed to operate without g ggeg [o) safety valves shall be constructedAto operate without chattering and to attain rated lift at a pressure not greater than 3% above their set pressures. chattering and to attain rated lift at a pressure not greater than 3% above their set pressures.
'(O/~oc rJves weed for udiw sA- servjce_
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NC-7512.2 Opening Pressure Tolerance (a) The opening pressure tolerance plus or minus shall not exceed the following: 2 psi for pressures up to and including 70 psi,3% for pressures over 70 psi to 300 psi,10 psi for pressures over 300 psi to 1000 psi, and 1% for pressures over 1000 psi. (b) Conformance with the requirements of(a) above - shall be established for each production valve by test. Steam valves shall be tested on steam.
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s . h NC7512.3 Blowdown Requirements. Safety valves NG7512.3 Blowdown Requirements. shall be adjusted to close after blowing down to a pressure not lower than that specined in the valve Design Speciacation. The adjustment shall be deter. 3 mined by test or by proration from the.Certiacate d/ % Safety valves shall be adjusted to close after blowing down to a Holder's blowdown test data. pressure not lower than that specided in the valve Design Speciacation. br J6 ll0s M Lt Or
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Con Orma r14 e n/ M t d bo a. &J be ntashd Sec e sc h vshe by full leJ.dion u oa s tw . & +edsgk // 6-sf s o scceunI~ ValVc hs We 1>d~c r o le + i in occ u ure hstes l jl, yf ek J .
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