ML19296D187: Difference between revisions
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Sd 14 15 LIC E *.SE N v"/ s t H 3 8 3 LICE %EE LUSE CON'T 3 l 4 l 6 j@l 015 l1 1817 9 l@l0 3 l 017 l9EJl@ | Sd 14 15 LIC E *.SE N v"/ s t H 3 8 3 LICE %EE LUSE CON'T 3 l 4 l 6 j@l 015 l1 1817 9 l@l0 3 l 017 l9EJl@ | ||
i s REPURT le 1 8 | i s REPURT le 1 8 | ||
3 E lL}@l0l5l0l-l0 | 3 E lL}@l0l5l0l-l0 60 ta l ; ZKETN/.hsEH M 63 EV ENT DATE 14 h DATE EVENT DESCRIPTION AND PROBADLE CONSEQUE*JCES h l o 2 LI_t was determined a reportable event existed in that some hydraulic snubbers may not There was no danger to the health and l 0 3i t have filfilled their functional requirements. | ||
60 ta l ; ZKETN/.hsEH M 63 EV ENT DATE 14 h DATE EVENT DESCRIPTION AND PROBADLE CONSEQUE*JCES h l o 2 LI_t was determined a reportable event existed in that some hydraulic snubbers may not There was no danger to the health and l 0 3i t have filfilled their functional requirements. | |||
No seismic event was experienced during j o 4 j saf ety of the public or station personnel. | No seismic event was experienced during j o 4 j saf ety of the public or station personnel. | ||
l c s I this period. (NP-32-79-07) | l c s I this period. (NP-32-79-07) | ||
Line 41: | Line 39: | ||
CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i lo j l The cause of this occurrence has been determif.ed to be due in part to both improper TJT]l initial installation and self-imposed performance limits uhich were too restrictive. | CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i lo j l The cause of this occurrence has been determif.ed to be due in part to both improper TJT]l initial installation and self-imposed performance limits uhich were too restrictive. | ||
l 1 been tested and ; | l 1 been tested and ; | ||
,j q l All safety related snubbers of less than 50,000 pounds capacity have 29, 1979. l y l all deficiencies corrected as of June | ,j q l All safety related snubbers of less than 50,000 pounds capacity have 29, 1979. l y l all deficiencies corrected as of June l | ||
l | |||
i 4 l H0 7 8 3 OTHER STATUS DI SC O HV OlSCOVERY DESCRIPTION | i 4 l H0 7 8 3 OTHER STATUS DI SC O HV OlSCOVERY DESCRIPTION | ||
' .PO'/. E R STA 5 5044.01 l 7 | ' .PO'/. E R STA 5 5044.01 l 7 | ||
i 5 8 9 | i 5 8 9 | ||
]@ 17 0l0l0l@l NA 12 11 44 l l B l@l Surveillance Test ST d5 46 80 ACTIVITY CONTENT LOCATION OF RELEASE AYOUNT OF ACTIVITY | ]@ 17 0l0l0l@l NA 12 11 44 l l B l@l Surveillance Test ST d5 46 80 ACTIVITY CONTENT LOCATION OF RELEASE AYOUNT OF ACTIVITY RELE ASED OF AE LE ASE NA l NA l g lzl l l1 l6l 10 44 45 80 1 8 9 It PEHSONNE L E XPOSURE S NUYMEH DE SCRIP TION l | ||
RELE ASED OF AE LE ASE NA l NA l g lzl l l1 l6l 10 44 45 80 1 8 9 It PEHSONNE L E XPOSURE S NUYMEH DE SCRIP TION l | |||
LLLI8 9I 010101@lzTYPF@lN^ | LLLI8 9I 010101@lzTYPF@lN^ | ||
7 11 12 13 80 PERSONNE L INJURIE S NUveE H CESCRIPflON I | 7 11 12 13 80 PERSONNE L INJURIE S NUveE H CESCRIPflON I | ||
Line 58: | Line 51: | ||
NAME OF PnEPAnER | NAME OF PnEPAnER | ||
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR P0h'ER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 DATE OF EVENT: May 18, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Hydraulic snubbers deficiency Conditions Prior to Occurrence: The unit was in Mode 5, with Power (ETT) = 0, and Load (Gross $$'C) = 0. | TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR P0h'ER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 DATE OF EVENT: May 18, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Hydraulic snubbers deficiency Conditions Prior to Occurrence: The unit was in Mode 5, with Power (ETT) = 0, and Load (Gross $$'C) = 0. | ||
Description of Occurrence: At 1000 hours on May 18, 1979, it was determined a repor-table event existed in that some hydraulic snubbers may not have fulfilled their functional requirements. | Description of Occurrence: At 1000 hours on May 18, 1979, it was determined a repor-table event existed in that some hydraulic snubbers may not have fulfilled their functional requirements. | ||
Line 68: | Line 60: | ||
(D) Two snubbers had non-ethylene-propylene gasket material. | (D) Two snubbers had non-ethylene-propylene gasket material. | ||
(E) Failure to meet lockup and biced rate requirements 1 A total of 288 snubbers were removed and functionally tested. Of these, 152 did not meet all of the acceptance criteria. This report is being submitted in accordance with Technical Specification 6.9.1.8.f. | (E) Failure to meet lockup and biced rate requirements 1 A total of 288 snubbers were removed and functionally tested. Of these, 152 did not meet all of the acceptance criteria. This report is being submitted in accordance with Technical Specification 6.9.1.8.f. | ||
Designa tion of Apparent Cause of Occurrence: The snubbers not meeting their accep-tance criteria has been attributed to the following causes: | Designa tion of Apparent Cause of Occurrence: The snubbers not meeting their accep-tance criteria has been attributed to the following causes: | ||
: 1. Improper handling, installation, and modifications made to snubbers 1 during plant construction | : 1. Improper handling, installation, and modifications made to snubbers 1 during plant construction | ||
: 2. Self-imposed performance limits which were too restrictive LER #79-057 | : 2. Self-imposed performance limits which were too restrictive LER #79-057 | ||
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. No seismic event was experienced during the period. | TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. No seismic event was experienced during the period. | ||
Corrective Action: Under R11ntenance Work order 79-2009, and as per Surveillance Test ST 5044.01, safety related snubbers with capacity of less than 50,000 pounds have been tested and deficient snubbers returned to original specifications. | Corrective Action: Under R11ntenance Work order 79-2009, and as per Surveillance Test ST 5044.01, safety related snubbers with capacity of less than 50,000 pounds have been tested and deficient snubbers returned to original specifications. |
Latest revision as of 14:43, 1 February 2020
ML19296D187 | |
Person / Time | |
---|---|
Site: | Davis Besse ![]() |
Issue date: | 05/30/1979 |
From: | Oneill J TOLEDO EDISON CO. |
To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
Shared Package | |
ML19296D185 | List: |
References | |
LER-79-057-01T, LER-79-57-1T, NUDOCS 8002290457 | |
Download: ML19296D187 (3) | |
Text
U. S. NUCLE AR REGUL ATORY COMMISSION NRC r0RM 366 (7 71)
LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!
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l 1 ( 1T4FE l 1JOl@l57 LAT l l@
Sd 14 15 LIC E *.SE N v"/ s t H 3 8 3 LICE %EE LUSE CON'T 3 l 4 l 6 j@l 015 l1 1817 9 l@l0 3 l 017 l9EJl@
i s REPURT le 1 8
3 E lL}@l0l5l0l-l0 60 ta l ; ZKETN/.hsEH M 63 EV ENT DATE 14 h DATE EVENT DESCRIPTION AND PROBADLE CONSEQUE*JCES h l o 2 LI_t was determined a reportable event existed in that some hydraulic snubbers may not There was no danger to the health and l 0 3i t have filfilled their functional requirements.
No seismic event was experienced during j o 4 j saf ety of the public or station personnel.
l c s I this period. (NP-32-79-07)
I 10 le 1 I l
foI4 I 1
0 H l 80 7 8 9 CAUSE COY 8 VALVE SYSTEM CAUSE SU8 CODE SUBCODE CODE CODE SUBCODE COUPONENT CODE o 9 IX lX l@ Wh Wh 13 Sl Ul Pl 0l Rl Tlh l Dl@ W @ 18 13 .V 9 10 11 12
? 8 OCCU R R E P.C E REPORT REVISION SE QUENT I AL CODE TYPE NO REPORT NO.
@ ,agg; 17 19 l-l 10 s 17 I I/1 21 10111 24 29 3J Tl -
31 11 1 32
_ 21 .. 23 24 26 NPR D-4 PRlYE COYP. COYPONENT FFFECT SH U f DO /.N ATT ACHY E NT YAN:#ACTURER ACT ION FUTLuE HOURS SUBVITTED FORM duts LLPP LIE H TAKEN ACTtON oN P L A*.T YETWCD WQ 12 j@ [1]l l 5 j
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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i lo j l The cause of this occurrence has been determif.ed to be due in part to both improper TJT]l initial installation and self-imposed performance limits uhich were too restrictive.
l 1 been tested and ;
,j q l All safety related snubbers of less than 50,000 pounds capacity have 29, 1979. l y l all deficiencies corrected as of June l
i 4 l H0 7 8 3 OTHER STATUS DI SC O HV OlSCOVERY DESCRIPTION
' .PO'/. E R STA 5 5044.01 l 7
i 5 8 9
]@ 17 0l0l0l@l NA 12 11 44 l l B l@l Surveillance Test ST d5 46 80 ACTIVITY CONTENT LOCATION OF RELEASE AYOUNT OF ACTIVITY RELE ASED OF AE LE ASE NA l NA l g lzl l l1 l6l 10 44 45 80 1 8 9 It PEHSONNE L E XPOSURE S NUYMEH DE SCRIP TION l
LLLI8 9I 010101@lzTYPF@lN^
7 11 12 13 80 PERSONNE L INJURIE S NUveE H CESCRIPflON I
~ fT1101010@lNA J 8 9 11 12 80 LOSS OF on OAVAGE TO F ACILITY TYPE DE SC RIPT ION NA 8002290 57 l o n11 7 U 9 zi@l to tic Punt act TY ,
NRC USE ONLY
- 2 o ISSU l Ni E p@lDE NA SCniPTION lllllllllllll2 68 69 80 5 7 8 9 10 DVR 79-074 Mn J . 0 % m pyoys 419-259-5000. Nr. 2s2 {
NAME OF PnEPAnER
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR P0h'ER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 DATE OF EVENT: May 18, 1979 FACILITY: Davis-Besse Unit 1 IDENTIFICATION OF OCCURRENCE: Hydraulic snubbers deficiency Conditions Prior to Occurrence: The unit was in Mode 5, with Power (ETT) = 0, and Load (Gross $$'C) = 0.
Description of Occurrence: At 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> on May 18, 1979, it was determined a repor-table event existed in that some hydraulic snubbers may not have fulfilled their functional requirements.
Plant snubbers, nuclear safety related with a capacity of less than 50.000 pounds, were in the process of being tested per Surveillance Test ST 5044.01, " Inspection of Safety Related Snubbers", which removes each snubber from its field location and tests the snubber on a test stand.
1l The following is a list of some of the deficiencies which existed:
(A) Some snubbers had fittings installed which may not have provided seal, and may have permitted air in-leakage to degrada snubber performance.
(B) Fluid reservoirs were installed on some snubbers with orientations which may not have allowed the reservoir to perform properly and/or allowed air in-leakage.
(C) Installation of brackets mounting the local reservoirs for three snubbers were not per design and required removal of cap head body bolts which could have allowed air into the hydraulic cylinders and possibly disturbed the o-ring seals.
(D) Two snubbers had non-ethylene-propylene gasket material.
(E) Failure to meet lockup and biced rate requirements 1 A total of 288 snubbers were removed and functionally tested. Of these, 152 did not meet all of the acceptance criteria. This report is being submitted in accordance with Technical Specification 6.9.1.8.f.
Designa tion of Apparent Cause of Occurrence: The snubbers not meeting their accep-tance criteria has been attributed to the following causes:
- 1. Improper handling, installation, and modifications made to snubbers 1 during plant construction
- 2. Self-imposed performance limits which were too restrictive LER #79-057
TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE PAGE 2 SUPPLEMENTAL INFORMATION FOR LER NP-32-79-07 Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. No seismic event was experienced during the period.
Corrective Action: Under R11ntenance Work order 79-2009, and as per Surveillance Test ST 5044.01, safety related snubbers with capacity of less than 50,000 pounds have been tested and deficient snubbers returned to original specifications.
During the time period between May 12, 1979 and June 29, 1979, 288 snubbers were removed and functionally tested. Of these, 152 failed and were rebuilt by ITT 1
Grinnell at their Warren, Ohio facility, by Wyle Engineering Laboratories, or onsite.
When the snubbers were returned, they were tested onsite and reinstalled. Surveil-lance Test ST 5044.01 was performed on the snubbers and a separate inspection com-pleted by Toledo Edison Quality Control personnel. All non-conformances from these inspections were cleared, and all snubbers were operable on June 29, 1979.
Engineering is re-evaluating the acceptance criteria for snubbers to establish realistic perf ormance limits.
Failure Data: There have been no previously reported similar occurrences.
LER #79-057