ML20234F605
| ML20234F605 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 12/31/1987 |
| From: | Shelton D TOLEDO EDISON CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 1460, TAC-51084, NUDOCS 8801120010 | |
| Download: ML20234F605 (2) | |
Text
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TOLEDO EDISON
. Docket No. 50-346 DONALD C. SHELTON -
Vom Presdent-Nurinar License No. NPF-3 Serial'No. 1460 December 31, 1987
. United States Nuclear Regulatory Commission Document Control Desk Washington, D. C.
20555
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Subject:
Davis-Besse Conformance'to Regulatory Guide 1.97, Revision 3
Gentlemen:
By' letter dated November. 25, 1987 (Log No. 2447), the Nuclear Regulatory
'Commis91on'(NRC) requested Toledo Edison (TED) to confirm that certain outstar31ng modifications related to Regulatory Guide 1.97 would be
'implev red during the fifth and sixth refueling outages'. The letter also e,uested TED.to confirm that containment air.is continuously monitored by.a Class. 1E containment high range radiation monitor measuring both iodine and particulate activity.-
Normal range radiation monitors do continuously monitor the particulate, fodine and gross radioactivity in the containment vessel atmosphere. When
-the noble gas activity, measured by Class 1E normal. range monitors, exceeds a predetermined setpoint-(3X10E-2 micro curies /cc), a " splitter" block at the inlet to the normal range skid 1s utilized to transfer the sample to the accident (or high)' range monitors. These high range monitors consist of~ filters used to collect particulate and iodine samples.which are removed and counted to quantify radioactivity.
Our current schedule for the outstanding modifications is as follows:
Modification Schedule (1)' Install Atmospheric Vent Valve (AVV)
Fifth Refueling Outage position indication (2) Extend the range of' Reactor Coolant System Fifth Refueling Outage (RCS) pressure indication (3) Modify neutron flux system Fifth Refueling Outage (4) Provide the control room with Steam and Fifth Refueling Outage y
Feedwater Rupture Control System (SFRCS) startup-level indication (5) Install Main Steam Safety Valve Position See Below indication j
THE TOLED" C"'*""i maaomv rnisnN PL AZA 300 MADISON AVENUE TOLEDO, OHIO 43652 8801120010 871231E PDR ADOCK 05000346 P
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fDocke't,No. 50-346
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License'No. NPF-3.
'n Serial No. 1460 Page 2;
.As' discussed in:our November 13, 1987 meeting with the NRC concerning Lfifth refueling outage! work, Davis-Besse's 1967 operating experience.
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- dictates'that'TED re-evaluate the commitment (Serial No'. 1232 dated January - 27, 1986) to install Main Steam Safety Valve.(MSSV) position indicators'during the fifth refueling outage and the
- need for this capability. This delay will-not affect TED's previous commitment to
. comply with Regulatory. Guide 1.97 by the completion of-the sixth refueling outage.'.The r& evaluation will be completed by July 31, 1989 which will allow adequate time to schedule potential work or any further discussions required to resolve this issue prior to the sixth refueling outage.
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~MSSV position indication was intended to provide the Control Room operator
.with direct indication of-MSSV position and enhance TED's' ability to more accurately reflect-steam flow rates.and, hence, radioactivity release l
rates. Currently, TED conservatively assesses offsite dose by assuming
.all steam flow through the MSSV hender is released to the. atmosphere.
-Indirect means are used to ascertain MSSV position (e.g., SG pressure,- RCS.
temperature, visual. inspection and!the audible noise caused by MSSVs lifting). These measures are considered adequate pending resolution'of-this-issue ~since there are currently no operator actions:in the Davis-Besse abnormal proceduresfassociated with MSSV position.
Sincere
- ours, BS:bamL cc: DB-1 Resident Inspector A..B. Davis, Regional Administrator A. W. DeAgazio j
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