05000346/LER-1980-066-03, /03L-1:between 800829 & 0921,doors to Spent Fuel Pool Area Blocked Open on Nine Occasions.Caused by Personnel Error on Part of Const Workers.Two Memos Issued to Reinforce Special Order 88-1 Previously Issued

/03L-1:between 800829 & 0921,doors to Spent Fuel Pool Area Blocked Open on Nine Occasions.Caused by Personnel Error on Part of Const Workers.Two Memos Issued to Reinforce Special Order 88-1 Previously Issued

ML19340B578
Person / Time
Site:	Davis Besse
Issue date:	09/26/1980
From:	Melstad K TOLEDO EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19340B573	List: 05000346/LER-1980-066, Forwards LER 80-066/03L-1 05000346/LER-1980-066-03, /03L-1:between 800829 & 0921,doors to Spent Fuel Pool Area Blocked Open on Nine Occasions.Caused by Personnel Error on Part of Const Workers.Two Memos Issued to Reinforce Special Order 88-1 Previously Issued
References
LER-80-066-03L, LER-80-66-3L, NUDOCS 8011110317
Download: ML19340B578 (3)

LER-1980-066, /03L-1:between 800829 & 0921,doors to Spent Fuel Pool Area Blocked Open on Nine Occasions.Caused by Personnel Error on Part of Const Workers.Two Memos Issued to Reinforce Special Order 88-1 Previously Issued

Event date:
Report date:
3461980066R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COMMISSION NRC FO"M 366 (7 778 LICENSEE EVENT REPORT n,U CONTROL BL OCK: l l

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B 60 61 DOCKET NUMBER 68 b9 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

,1[@ l (NP-33-80-79) on nine occasions between 8/29/80 and 9/21/80, operators making plant l

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l 0 p.t l l boundary for the spent fuel pool area. This causes a reduction in the capacity of thel its required negative pres-l I O J s j l Emergency Ventilation System (EVS) to maintain the area at Theref ore, the station entered the action statement of T.S. 3.9.12.

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TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORMATION FOR LER NP-33-80-79 1

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1 DATE OF EVENT: August 29, 1980 - September 21, 1980 FACILITY: Davis-Besse Un t 1 IDENTIFICATION OF C ~URRENCE:

Spent fuel pool negative pressure boundary doors left open.

Conditions Prior to Occurrence: The unit was in Mode 5 with Power (MWT) = 0 and Load (Gross MWE) = 0.

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Description fo Occurrence: On nine occasions between August 29, 1980 and September 21, 1980, operators making plant tours found doors blocked open. The doors were part of the negative pressure boundary for the spent fuel pool area. The list includes: door 306 at 0400 hours0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br /> on August 29, 1980 (fuel handling area - 585' elevation), door 306 at 1200 hours0.0139 days <br />0.333 hours <br />0.00198 weeks <br />4.566e-4 months <br /> on August 29, 1980 (fuel handling area - 585' elevation), door 400 at 2200 hours0.0255 days <br />0.611 hours <br />0.00364 weeks <br />8.371e-4 months <br /> on September 2, 1980 (auxiliary building - southwest stairway - 603' elevation),

door 406 at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> on September 5, 1980 (fuel handling access corridor - 603' eleva-tion), door 400 at 0911 hours0.0105 days <br />0.253 hours <br />0.00151 weeks <br />3.466355e-4 months <br /> on September 6,1980 (auxiliary building - southwest stairway - 603' elevation), door 302 at 1246 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.74103e-4 months <br /> on September 6, 1980 (auxiliary build-ing - southwest stairway - 585' elevation), door 306 at 0310 hours0.00359 days <br />0.0861 hours <br />5.125661e-4 weeks <br />1.17955e-4 months <br /> on Sept mber 9,1980 (fuel handling area - 585' elevation), door 406 at 0430 hours0.00498 days <br />0.119 hours <br />7.109788e-4 weeks <br />1.63615e-4 months <br /> on September 20, 1980 (fuel handling access corridor - 603' elevation), and door 306 at 1715 hours0.0198 days <br />0.476 hours <br />0.00284 weeks <br />6.525575e-4 months <br /> on September 1

21,1980 (fuel handling area - 585' elevation).

In eash case, had the Emergency Ventilation System (EVS) been needed, the blocked open doors would have reduced the ability.of the system to maintain the storage pool area at a negative pressure of 21 1/8 inch water gauge relative to the outside atmosphere during system operation. Therefore the station had entered the action statement of Technical Specification 3.9.12 which would have required the suspension of any operations involving the movement of fuel within the storage pool or crane operations with loads over the pool had there been any in progress.

Designation of Apparent Cause of Occurrence: The cause of the findings is personnel error in disregarding signs posted on the doors. The signs indicate the door must remain closed and explain that anyone needing to block the doors must first contset,the Shift Supervisor. These doors became important during this first refueling outage when irradiated fuel was placed in the spent fuel pool. With irradiated fuel in the pool, the spent fuel pool EVS must now be operable. These doors have been heavily traveled during this outage with many outside construction people on site moving equipment through these doors.- These doors were apparently blocked open to make it easier to move equipment. All of these doors have permanent signs which had been previously in-1 stalled whici read: NEGATIVE PRESSURE BOUNDARY DOOR. REQUIRED FOR SPENT FUEL POOL VENTILATION. DOOR MUST BE CLOSED EXCEPT FOR NORMAL PASSAGE IN ALL MODES.

Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel. There were no fuel handling operations being conducted during this time, nor any crane operations with loads over the storage pool.

LER #80-066

W TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE SUPPLEMENTAL INFORK\\ TION FOR LER NP-33-80-79 PAGE 2

Corrective Action

In all of the above cases, the doors were closed and the Shift Supervisor notified. Special Order No. 88-1 was written August 4, 1980 and dis-tributed to all station personnel to inform them of 'the importa i.; of the spent fuel pool area doors. To reinforce this order, two additional memos were issued.

Memo M80-2078 was issued to all Toledo Edison personnel and construction supervisors and foremen emphasizing the proper use of the doors, and memo M80-2079 was issued to all security with the same information.

Failure Data: A similar finding was reported in Licensee Event Report NP-33-80-56 (80-047).

I LER #80-066 e-i

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