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{{#Wiki_filter:r N?.C h0XM 066 U. S. NUCLE AR R EGULATORY COMMISSION (7 77) | {{#Wiki_filter:r N?.C h0XM 066 U. S. NUCLE AR R EGULATORY COMMISSION (7 77) | ||
< LICENSEE EVENT REPORT | < LICENSEE EVENT REPORT I l CONTROL SLOC4: l l l l l (PLEASE PRINT OR TYPE ALL RECUIRED INFORVATIONI (A,/ ' | ||
I l CONTROL SLOC4: l l l l l (PLEASE PRINT OR TYPE ALL RECUIRED INFORVATIONI (A,/ ' | |||
* lo li j j Ml Al P J P j Sl 1l@l 0l 0l -l 0l 0l 0l 0l 0l -l 01 01@l IS 4 11 l 1 1 I l 1 l@l l l@ | * lo li j j Ml Al P J P j Sl 1l@l 0l 0l -l 0l 0l 0l 0l 0l -l 01 01@l IS 4 11 l 1 1 I l 1 l@l l l@ | ||
7 s 3 LICENSEE CCOE 64 15 LaCENSE NWE E R 25 LICENSE TvPt JO 57 OAT sd CCN'T l0l1l $,"C l60L @l0 l 5 l OCCKET 01 -lNUMB 0l ER 21 91 3@l0 l21215 i 8 ! 1 @l 0 l }REFCR l 11018 l 140 '@ | 7 s 3 LICENSEE CCOE 64 15 LaCENSE NWE E R 25 LICENSE TvPt JO 57 OAT sd CCN'T l0l1l $,"C l60L @l0 l 5 l OCCKET 01 -lNUMB 0l ER 21 91 3@l0 l21215 i 8 ! 1 @l 0 l }REFCR l 11018 l 140 '@ | ||
4 68 63 EVENT DATE 74 75 7 O ATE 1 St EVENT CESCRIPTICN ANO PRCS ASLE CCNSEQUENCES h t o 121 I In the event that the AWS System aLtuates in Lts intended c:anner analysis indi- ! | 4 68 63 EVENT DATE 74 75 7 O ATE 1 St EVENT CESCRIPTICN ANO PRCS ASLE CCNSEQUENCES h t o 121 I In the event that the AWS System aLtuates in Lts intended c:anner analysis indi- ! | ||
Io 6 3i i cates that a violatioa of primary containment would exist. The flow path j i | Io 6 3i i cates that a violatioa of primary containment would exist. The flow path j i j o .4 ; l would be from the scram Discharge Volume through the vent and drain valves to i 4 | ||
j o .4 ; l would be from the scram Discharge Volume through the vent and drain valves to i 4 | |||
1o is1 l the reactor building atmosphere. Refer to attachment for additional information. I 104511 l l047l l l 10 i s t i I F S 9 8I SYSTEV CAUSE CAUSE CCM P. VALV E COCE CCOE SUSCCCE COMPCNENT " COE JU8COOE SLSCOCE FfT1 7 3 | 1o is1 l the reactor building atmosphere. Refer to attachment for additional information. I 104511 l l047l l l 10 i s t i I F S 9 8I SYSTEV CAUSE CAUSE CCM P. VALV E COCE CCOE SUSCCCE COMPCNENT " COE JU8COOE SLSCOCE FfT1 7 3 | ||
'l S! al@ W@ l Al@ l 2l Zi Zl'l ZI Zlh l Zl@ l Zl@ | 'l S! al@ W@ l Al@ l 2l Zi Zl'l ZI Zlh l Zl@ l Zl@ | ||
Line 40: | Line 36: | ||
, i3; Idrain valves to close. On March 3,1981 a oicine modification was implemented to end I i | , i3; Idrain valves to close. On March 3,1981 a oicine modification was implemented to end I i | ||
ii;2 ; l sure venting of the SDV Isola tion Valves in the event of AWS initiated scrr . I 7 5 3 $0 l A %80wER CTwtR STATUS IS O RV Of SCCVERY CESCRIPTION N.A. | ii;2 ; l sure venting of the SDV Isola tion Valves in the event of AWS initiated scrr . I 7 5 3 $0 l A %80wER CTwtR STATUS IS O RV Of SCCVERY CESCRIPTION N.A. | ||
D { s' l' l E l@ l 0l 7l 5l@l | D { s' l' l E l@ l 0l 7l 5l@l N.A. | ||
N.A. | |||
l lZl@l ' | l lZl@l ' | ||
l AC nvtTV CO$YENT RELEAsEo LOCATION C5 RELEASE @ | l AC nvtTV CO$YENT RELEAsEo LOCATION C5 RELEASE @ | ||
Line 49: | Line 42: | ||
45 | 45 | ||
@N.A. l 30 l | @N.A. l 30 l | ||
8 9 | 8 9 7 to 1 8ER$CNNEL Ex'CSURES NUM9ER TYPE DESCRIPT:CN Ii l 71 l 010 l 0 ' l@l' Z l@l CA. ! | ||
7 to 1 8ER$CNNEL Ex'CSURES | |||
PERSONNEt.\NJURIES NUM9ER DESCRIPT1CN ( | PERSONNEt.\NJURIES NUM9ER DESCRIPT1CN ( | ||
liisll010l0l@l 7 8 9 11 '2 N.A. | liisll010l0l@l 7 8 9 11 '2 N.A. | ||
Line 63: | Line 53: | ||
NAME OF PREPARER | NAME OF PREPARER | ||
. omas M oughlin awCNE: 617-746 '7900 2 ! | . omas M oughlin awCNE: 617-746 '7900 2 ! | ||
810ssooleg | 810ssooleg | ||
BOSTON EDISON CodPANY , | BOSTON EDISON CodPANY , | ||
PILGRIM NUCLEAR POWER STATION ' | PILGRIM NUCLEAR POWER STATION ' | ||
DOCKEI NO. 50-293 Attach =ent to Ln 81-004/01T-0_ | DOCKEI NO. 50-293 Attach =ent to Ln 81-004/01T-0_ | ||
Descrip tion On February 25, 1981, the ORC reviawed thc operation of the ATWS system i which was installed on May 12, 1980 during.PNPS Refuel IV Outage. The i | |||
Descrip tion | |||
On February 25, 1981, the ORC reviawed thc operation of the ATWS system i | |||
which was installed on May 12, 1980 during.PNPS Refuel IV Outage. The i | |||
review indicated that, in the event that the Backup Scram Solenoids failed | review indicated that, in the event that the Backup Scram Solenoids failed | ||
~ | ~ | ||
and the ATWS System initiated to scram the reactor, closure of the Scram | and the ATWS System initiated to scram the reactor, closure of the Scram | ||
. Discharge' Volume (SDV) vent and' drain valves would be inhibited because the vent path ~ for their' air solenoids would be blocked. This blockage occurs because actuation of the ATWS/ARE Solenoid Valves isolates the SDV air colenoids air supply header from the vent. Inability of SDV vent and drain valves 'to close' following a scram would result in a breach of primary con- | . Discharge' Volume (SDV) vent and' drain valves would be inhibited because the vent path ~ for their' air solenoids would be blocked. This blockage occurs because actuation of the ATWS/ARE Solenoid Valves isolates the SDV air colenoids air supply header from the vent. Inability of SDV vent and drain valves 'to close' following a scram would result in a breach of primary con-tainment in that a scram discharge water flow path would exist through the SDV Isolation Valves to the reactor building. f Cause and Corrective Action ' , | ||
tainment in that a scram discharge water flow path would exist through the SDV Isolation Valves to the reactor building. f | |||
Cause and Corrective Action ' , | |||
' The root cause of ~ this problem was inappr'opriate review of the design modi-fication.'. On March 3,1981 a SDV. air s apply line design chenge was imple-mented via. Field Revision Notice Number 79-25-44. TSis -modification revised | ' The root cause of ~ this problem was inappr'opriate review of the design modi-fication.'. On March 3,1981 a SDV. air s apply line design chenge was imple-mented via. Field Revision Notice Number 79-25-44. TSis -modification revised | ||
,tne original ~ desian to correct its deitaiencies. The modification consisted - | ,tne original ~ desian to correct its deitaiencies. The modification consisted - | ||
/ - - of relocating the half-inch copper air supply line for the SDV Isolation | / - - of relocating the half-inch copper air supply line for the SDV Isolation Valves. from the upstream to the downstream side of the ATWS/ARI Solenoid ! | ||
Valves. from the upstream to the downstream side of the ATWS/ARI Solenoid ! | |||
;' JValves so' that isolation of the SDV occurs on actuation of either RP5 or l ATWS/ARI. 9 l | ;' JValves so' that isolation of the SDV occurs on actuation of either RP5 or l ATWS/ARI. 9 l | ||
f | f | ||
~PNPS _is 'in the process of revising our methods of reviewing and approving | ~PNPS _is 'in the process of revising our methods of reviewing and approving | ||
'modificatio'ns with more emphasis being placed on ' the conceptual phase and l | 'modificatio'ns with more emphasis being placed on ' the conceptual phase and l increased operational input from the station' which .should minimize the possi- (- | ||
increased operational input from the station' which .should minimize the possi- (- | |||
-i | -i | ||
-ibility of a recurrence'cf similar' events. | -ibility of a recurrence'cf similar' events. | ||
i i | i i | ||
1 | 1 s | ||
s | |||
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Latest revision as of 04:14, 18 February 2020
ML19350B514 | |
Person / Time | |
---|---|
Site: | Pilgrim |
Issue date: | 03/10/1981 |
From: | Mcloughlin M BOSTON EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
Shared Package | |
ML19350B513 | List: |
References | |
LER-81-004-01T, LER-81-4-1T, NUDOCS 8103200704 | |
Download: ML19350B514 (2) | |
Text
r N?.C h0XM 066 U. S. NUCLE AR R EGULATORY COMMISSION (7 77)
< LICENSEE EVENT REPORT I l CONTROL SLOC4: l l l l l (PLEASE PRINT OR TYPE ALL RECUIRED INFORVATIONI (A,/ '
- lo li j j Ml Al P J P j Sl 1l@l 0l 0l -l 0l 0l 0l 0l 0l -l 01 01@l IS 4 11 l 1 1 I l 1 l@l l l@
7 s 3 LICENSEE CCOE 64 15 LaCENSE NWE E R 25 LICENSE TvPt JO 57 OAT sd CCN'T l0l1l $,"C l60L @l0 l 5 l OCCKET 01 -lNUMB 0l ER 21 91 3@l0 l21215 i 8 ! 1 @l 0 l }REFCR l 11018 l 140 '@
4 68 63 EVENT DATE 74 75 7 O ATE 1 St EVENT CESCRIPTICN ANO PRCS ASLE CCNSEQUENCES h t o 121 I In the event that the AWS System aLtuates in Lts intended c:anner analysis indi- !
Io 6 3i i cates that a violatioa of primary containment would exist. The flow path j i j o .4 ; l would be from the scram Discharge Volume through the vent and drain valves to i 4
1o is1 l the reactor building atmosphere. Refer to attachment for additional information. I 104511 l l047l l l 10 i s t i I F S 9 8I SYSTEV CAUSE CAUSE CCM P. VALV E COCE CCOE SUSCCCE COMPCNENT " COE JU8COOE SLSCOCE FfT1 7 3
'l S! al@ W@ l Al@ l 2l Zi Zl'l ZI Zlh l Zl@ l Zl@
9 13 11 12 13 18 19 23
_ S E QU ENTI AL OCOURRENCE mE70R? REVISION gga,no EVENT VEAR RE70RT NO. C00E Wet No.
@ 4Eg 18 11 l l-l 23 l010l4l 24 26 l/l 27 l 0 l 11 29 23 lTl 20 l-l at l01
_ 21 22 22 7 N AC CN CN P T wtT HCURS SS I FCA S. S P*L E MANUFAC RER lF 22
!@l24Z l@ lZl@
a lZl@
a l0l0l010l se e W@ U@ l Zl@
4i 42 43 lu ZI 91 91 9l@ 47 CAUSE CESCRIPTION AND CCRRECTIVE ACTIONS h I i t o t I The direct cause of this situation was an oversizht in the desien. Ac tua tion of the !
Ii6il l AWS ARI solenoids, which were installed as ourlied in Pncu 79-2 5. would t,revent t i,,2! l bleed-of f of the instrument air header which must be decleted to oermit the vent andl 4
, i3; Idrain valves to close. On March 3,1981 a oicine modification was implemented to end I i
ii;2 ; l sure venting of the SDV Isola tion Valves in the event of AWS initiated scrr . I 7 5 3 $0 l A %80wER CTwtR STATUS IS O RV Of SCCVERY CESCRIPTION N.A.
D { s' l' l E l@ l 0l 7l 5l@l N.A.
l lZl@l '
l AC nvtTV CO$YENT RELEAsEo LOCATION C5 RELEASE @
l$ IsllZl@,aRELEAsEd@l AuCUNT N.A. OF ACWTY 44 l
45
@N.A. l 30 l
8 9 7 to 1 8ER$CNNEL Ex'CSURES NUM9ER TYPE DESCRIPT:CN Ii l 71 l 010 l 0 ' l@l' Z l@l CA. !
PERSONNEt.\NJURIES NUM9ER DESCRIPT1CN (
liisll010l0l@l 7 8 9 11 '2 N.A.
60 I !
I I
LCSS OF CA DAMACE TO FACILITY h W75 CESCRIPTICN . %./ d N.A. l l 1 : 191 4 9 l 21@lto SO 4 7
8V8LICITY NRC USE CNLY OESCRIPTION 45 _
- g ISSUE 3 ,
.12 I c j Whl N.A. 1 l1III!IIII IIlI 1 .s a 50 6a es so ; ;
NAME OF PREPARER
. omas M oughlin awCNE: 617-746 '7900 2 !
810ssooleg
BOSTON EDISON CodPANY ,
PILGRIM NUCLEAR POWER STATION '
DOCKEI NO. 50-293 Attach =ent to Ln 81-004/01T-0_
Descrip tion On February 25, 1981, the ORC reviawed thc operation of the ATWS system i which was installed on May 12, 1980 during.PNPS Refuel IV Outage. The i
review indicated that, in the event that the Backup Scram Solenoids failed
~
and the ATWS System initiated to scram the reactor, closure of the Scram
. Discharge' Volume (SDV) vent and' drain valves would be inhibited because the vent path ~ for their' air solenoids would be blocked. This blockage occurs because actuation of the ATWS/ARE Solenoid Valves isolates the SDV air colenoids air supply header from the vent. Inability of SDV vent and drain valves 'to close' following a scram would result in a breach of primary con-tainment in that a scram discharge water flow path would exist through the SDV Isolation Valves to the reactor building. f Cause and Corrective Action ' ,
' The root cause of ~ this problem was inappr'opriate review of the design modi-fication.'. On March 3,1981 a SDV. air s apply line design chenge was imple-mented via. Field Revision Notice Number 79-25-44. TSis -modification revised
,tne original ~ desian to correct its deitaiencies. The modification consisted -
/ - - of relocating the half-inch copper air supply line for the SDV Isolation Valves. from the upstream to the downstream side of the ATWS/ARI Solenoid !
- ' JValves so' that isolation of the SDV occurs on actuation of either RP5 or l ATWS/ARI. 9 l
f
~PNPS _is 'in the process of revising our methods of reviewing and approving
'modificatio'ns with more emphasis being placed on ' the conceptual phase and l increased operational input from the station' which .should minimize the possi- (-
-i
-ibility of a recurrence'cf similar' events.
i i
1 s
)
w --
+7- e w w