ML19327A738
| ML19327A738 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 10/06/1989 |
| From: | Shelton D TOLEDO EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 1710, NUDOCS 8910180005 | |
| Download: ML19327A738 (3) | |
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.G-Q TOLEDO EDISON A Cent *1er Ers ;p Compay D - %Lo C. SHELTON ve. % m e Docket. Number 50-346 License Number NPF-3
-Serial Number 1710 October 6. 1989 United States Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555 Subject - Use of Temporary Containment Personnel Airlock Doors During Refueling Operations Gentleman:
During the Davis-Besse Nuclear Power Station (DBNPS), Unit Number 1 fifth retfueling outage-in-1988, DBNPS utilized temporary containment personnel
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airlock doors during refueling-(Mode 6) operations involving core alterations or'rovement 'of irradiated fuel within containment. This concept for meeting E
-Technical Specification (TS) 3.9.4 requirements (i.e.,.one door,in the airlock
'must be closed during core alterations or movement of irradiated fuel within containment during refueling operations) was. discussed with the Nuclear i
Regulatory Commission > (NRC)/ Nuclear Reactor Regulstion (NRR) Senior Project Manager for DBNPS on-May 26, 1538, prior to its implementation during tPe fifth refueling outage. - Astification for the use of the temporary doors in lieu of the' normal airlock doors was provided as-follows:
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1) frequent opening and closing of the normal airlock doors during j
refueling operations can cause damage to the latching mechanisms.-and j
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temporary doots, by the design considerations, provide the necessary barrier for mitigating the consequences of a fuel handling accident-
.In eontainment.
-The NRC/NRR Senior Project Manager for DBNPS agreed that the use of the temporary doors during the fif th refueling outage met the provisions and intent of TS 3.9.4.
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THE TOLEDO EOISON COMPANY EDISON PLAZA 300 MADISON AVENUE-TOLEDO, OHIO 43652 8910EBOOC5-891006
]DR ADOCK 0500034 a
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1 Docket Nu:b:r 50-346
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. License Number NPF 3 Serial N uber 1710
.Page 2 The future use of temporary containment personncl airlo m doors during refueling operations has been evaluated by Toledo Edisen pursuant to the-requirenients of 10CFR50.59, and has resulted in the decision to use the temporary doors during the upcoming sixth refuelir.g outage (scheduled to begie February 1,1990) and in future refueling outages. The safety evaluation conducted purruant to requirement of 10CFR50.59 has concluded that the temporary doors are effective in precluding the potential damage to the normal airlock door latching mechanisms during periods of frequent ope.nings and closings and provide the necessat; barrier for mitigating the consequences of
- a fuel handlint accident in Mode 6 when the potentiL1 for containment pressurization does not exist. The Davis-Besse Updated Safety Analysis Report (USAR), Section 15.4.7.3, addresses a fuel handling accident inside containm et.
No credit is taken for conta!nment isolation. Thus, the use of temporary uoors vill not affect the USAR analysts.
The temporary doors vill not be used during reduced reactor coolant inventory operations as discussed in Generic Letter Number 88-17.
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The design cons!derations incorporated for use of the temporary doors are as follovst 1)
The. temporary doors vill be solid wooden doors, with vireglass vindows, mounted in a structural steel fran.e attached to the airlock bulkhead. Joints and seams vill be caulked to seal the assembly.
Installation details vill not preclude the capability for closing the-normal containment personnel airlock doors.
2)
Only one door vill be able to be opened at a time during core alterations or movement of irradiated fuel within containment due to incorporation of an electrical interlock.
Administrative controls provide for: stationing of a dedicated individual (s) near the doors to
.i further ensure both doors vill not be opened simultaneously during core alterations or movement of irradiated fuel within containment.
3)
Post installation check of proper fit of each door and its associated gask.'t will be performed to assure that uncontrolled release of radioactivity vill not occur.
In addition, a temporary airborne radiation monitor vill be installed ir. the auxiliary building near the personnel airlock.
4)
The temporary doors will be removed from the airlocks prior to a return to Node 4.
The temporary doors vill be tested for proper interlock operation prior to declaring the doors operational.-
In the unlikely event that at least one of thc temporary airlock doors is not
- i closed during core alterations or movement of irradiated fuel within containment, the Action of TS 3.9.4 vill be followed.
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" n-l'4 Dockat Nurbe.' 50-346'
><i I!?' License Number NPF-3=
s-Serial'Nsaber:1710)
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Based cncthe above, ToledoLEdison has concluded that the use of temporary
- doors at;the containment personnel airlocks is acceptable and satisfies the requi:ewentsJof TS'3.9.4.
If you have any comments concerning the above, please contact Mr. RE V. Schrauder, Manager - Nuclear Licensing, at (419) 249-2366.
Very tr y yours;
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M.' Byron, DB-1 NRC Senior Resident Inspector
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U A. B. Davis, Regional Administrator, NRC Pegion III a
T.' V. Vambach, DB-1 NRC Senior Project Mapeyar 1:
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