ML20086J520
| ML20086J520 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 08/08/1974 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086J521 | List: |
| References | |
| AO-74-2, NUDOCS 8401240052 | |
| Download: ML20086J520 (2) | |
Text
m J
_ s",..m,N
.! ~
,;Q(
-h e
s.
x; 1
? (l.y( g,. \\,\\ j ig 7 /,,
- i PHILADELPHIA ELECTRIC COMPANY
/
l 2301 MARKET STREET p5.
h1974
- t j
4 e
PHILADELPHIA. PA.19101
, %,7 azisi 84i-4ooo 4
/ /*
.W August 8, 1974 E~ #
Mr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Corgnission Directorate of Licensing 50-278 Washington, DC 20545
Dear Mr. Giambusso:
Subject:
Abnormal Occurrence The following occurrence was reported to Mr. R. A. Feil, A.E.C.
Region 1 Regulatory Operations Of fice on July 29, 1974. Written noti-fication was made to Mr. James P. O'Reilly, Region 1 Regulatory Opera-tions Of fice en, July 29, 1974.
In accordance with Section 6.7.2.A of tha T.,-hnic.=1 % cificu<nne, n,n,n-,4ix A of DPD-56 f ar Vai t 3 Deee sottom atomic rcwer station, tne rollowing report is being submitted to the Directorate of Licensing as an Abnormal Occurrence.
Reference:
License Number DPR-56 Technical Specification Table 3 2.D Report No.:
50-278-74-2 Report Date:
August 8, 1974 Occurrence Date:
July 29,1974 Facility:
Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:
RIS-3-17-4580 refueling floor exhaust high radiation detector l
was found to have a trip point in excess of the Technical Specification value during instrument calibration Conditions Prior to Occurrence:
h Fuel loading of initial core in progress.
{p. [
' Q L/ [l Description of Occurrence:
\\
l R IS-3-17 l SPD refueling floor exhau.st high radiatien monitor i
[
was ' found t o h we a t-io point of about 24 FP/P actual during instra-
[
ment calibration. Technical Specification required setpoint is 16 mR/HR.
8401240052 740000 PDR ADOCK 05000278
~ 8 J, O g S
PDR COPY SIMP REGION 2
k
-O
r-w O
o M'r. A. Giambusso
"' " August 8, 1974 Page 2 Designation of Apparent Cause of Occurrence:
The device had been conservatively set to trip at 10 mR/HR indicated value. During the calibration of the device with an ex-ternal source, it was discovered that actual 16 mR/HR yicided an in-dicated value of 7 mR/HR. The device is a four-decade log device and this reading is within the instrument accuracy in percent of equivalent linear full scale. No problem exists with the instrumentation.
Analysis of Occurrence:
This device is one instrument in a.one-out-of-two-twice logic 3
1 which initiates a ventilation system isolation on refueling floor ex-haust high radiation. Since there is no irradiated fuel in Unit 3, there j
is no situation which could create the initiating signal. There are no safety implications associated with this trip point deviation.
Corrective Action:
All four devices which monitor refueling floor exhaust high radiation were set to trip at a more conservative indicated value. This indicated value, when compared to the actual calibration trip value, is i
significantly below the required actual 16 mR/HR in all cases.
Toilure Data:
This same problem occurred on a similar detector on Unit 2 and was reported as an Abnormal Occurrence on October 29, 1973 Very truly'yours, l['$ ~
/ 6 ll l {g $,/
/
A.
C6one'y j
Ass t Gen't Superintendent Generation Division 3
cc:. Mr. J. P. O'Reilly
' Director, Region i United States Atomic Energy Commission-631 Park Avenue King of Prussia, PA 19406 1
j i
i
.