ML20003J265
| ML20003J265 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/16/1981 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| IAL-81-19, NUDOCS 8105110131 | |
| Download: ML20003J265 (3) | |
Text
. _
/
d g
UNITED STATES
['-
g NUCLEAR REGULATORY COMMISSION E..
j REGION I 0,
631 PARK AVENUE gt,4 KING oF PRUSSIA, PENNSYLVANIA 19406 APR 161981 e
A e
Docket Nos. 50-277
(({
f l
50-278
(,
IAL File No. 81-19 p
jg t
IM
.) 79gT A -
O Philadelphia Electric Company Eg u,%
y ATTN: Mr. S. L. Daltroff mdC,@eco O
Vice President s
Electric Production g) 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
This refers to the April 15, 1981 telephone conversation between Mr. Cooney of your staff and Mr. McCabe of this office regarding the April 1, 1981 discovery of three isolated drywell pressure transmitters at Peach Bottom Unit 2.
Two of the isolated pressure transmitters supply initiation signals to emergency core cooling systems and the third provides an input to the reactor protection system. Although automatic safety syster actuation was not prevented, redundancy was degraded. This event indicates a lack of operational control over safety-significant components. To prevent recurrence, we understand that you have committed to the following.
1.
Expeditious conduct of a Unit 2 valve lineup check for all safety system actuation instruments, to include all instrument root valves. Valves located in radiation areas of one Roentgen per hour or greater will be checked during the next unit shutdown. The Plant Operations Review Committee will review this effort for adequacy.
2.
Development and approval of detailed Unit 2 and Unit 3 valve lineup check-lists which provide for independent verification of proper lineup of the above instruments.
3.
Conduct of a lineup using the approved checklists on Unit 2 as soon as practicable and on Unit 3 prior to Startup from the current refueling outage.
8105110/3ld Q
Philadelphia Electric Company 2
JhPR 161981 4.
Establishment, on a schedule consistent with the operational workload on technical staff, of a program to develop ana approve complete valve lineup checklists for instruments which are necessary for proper operation of safety-significant equipment or for operator knowledge of equipment status under accident conditions. The instruments involved include those which measure,. transmit, or indicate level, pressure, or flow in the following
- systems, a.
Primary Coolant b.
Condensate c.
Feedwater d.
Circulating Water e.
Reactor Protection f.
Primary Containment Isolation g.
Core Spray 1.
High Pressure Coolant Injection J.
Automatic Depressurization k.
Emergency Service Water n.
Emergency Cooling Water o.
High Pressure Service Water p.
Main Stack Radiation Monitoring q.
Vent Stack Radiation Monitoring r.
High Range Main Stack Radiation Monitoring s.
High Range Vent Stack Radiation Monitoring t.
Cont ol Rod Drive Hydraulic u.
Control Rod Drive Hydraulic Control linit v.
w.
Containment Atmospheric Dilution l
x.
Primary Containment Inerting l
y.
Standby Gas Treatment j
z.
Drywell Ventilation aa.
Drywell Chilled Water ab.
Reactor Building Ventilation ac.
Fire Main ad.
Cardox Fire Suppression (HPCI/ Cable Spreading Room / Control Room /Otesel) ae.
Control Room Ventilation For instruments not required for automatic actuation of safety systems and not required to undergo valve lineup to assure compliance with the technical specifications, if regular. checks can and do verify instrument loop perfor-I mance, the instruments involved need not be included in the valve lineups i
prescribed in this item.
l
L Philadelphia Electric Company 3
JWit 16100) 5.
Provide to this office within 10 days of receipt of this letter a written schedule for completion of the above items, with changes to that schedule to be submitted, and justified, to this office in writing.
If our understanding of your actions and commitments as described above is not in accordance with the actual actions and commitments involved, please contact this office by telephone immediately and in writing within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Sincerely, Bo e H. Grier Director cc:
W. T. Ullrich, Station Superintendent 1
,,,..,.,y,
,, - -,,..