ML19261F302
| ML19261F302 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 10/04/1974 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | |
| References | |
| GQL-0378, GQL-378, NUDOCS 7910250766 | |
| Download: ML19261F302 (4) | |
Text
9 AEC DISTRIBUTION FOR PART 50 DO'*IT MATERI AL_
(TEMPOR ARY FORM)
CONTROL NO: 10025 FILE: ENV FROM: Metr p litan Edison Co.
DATE OF DOC DATE REC'D LTR TWX RPT OTHER Reading, Pennsylvania 10-4-74 10-11-74 xxx R. C. A rn old TO: Mr. J. P. O'Reillv ORIG CC OTHER SENT AEC PDR2JJ 2s 1-signed SENT LOCAL PDP " "~
CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
xxxxxx 1
50-239 DESCRIPTION:
ENCLOSURES:
Ltr Reporting Abnorma1 Environmenta1 Occurrence #74-10 on 9-29-74 concerning PH valves outside the allowable range for four Waste Neutralizing Tank releases...
PLANT NAME:
Three Mile Island Station #1 FOR ACTION /INFORMATION L U M JG 3 BUTLER (L)
SCHWENCER (L) ZIEMANN (L)
REG AN (E)
W' Copies W/ Copies W/ Copies W/3 Copies CLAR K (L)
STOLZ (L)
DICKER (E)
LEAR (L)
W/ Copies W/ Copies W/ Copies W/ Copies PAR R (L)
VASSALLO (L)
KNIGHTON (E)
W/ Copies W/ Copies W/ Copies W/ Copies KNIEL (L)
PURPLE (L)
YOUNGB LOOD (E)
W/ Copies W/ Copies W/ Copies W/ Copies INTERNAL blSTRIBUTION 4FG P H c TECH REVIEW v6ENTON LIC ASST A/T IND 64EC PDR
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GRIMES B R AITM AN OGC, ROOM P-506A v6CHROEDER GAMMILL DIGGS (L)
SA LTZM AN dUNTZING/ STAFF MACCARY ASTN ER GEARIN (L)
B. HURT CASE KN:GHT ALLARD GOULBOURNE (L)
GIAMBUSSO PAWLICKl SPANGLER KREUTZER (E)
PLANS BOYD SHAO LEE (L)
MCDONALD MOORE (L) (BWR)
STELLO ENVIRO M AIG R ET (L)
CHAPMAN DEYOUNG (L) (P'#R)
HOUSTON v61U LLER MEED (E)
S-DUBE w/ input SKOVHOLT (L)
NOVAK DICKER SERVICE (L)
E. COUPE GOLLER (L)
ROSS KNIGHTON SHEPPARD (L)
P. CO LLINS IPPOLITO YOUNG B LOOD SLATER (E)
D. THOMPSON (2)
DENISE TEDESCO REGAN R itTH (L)
'KLECKER AG OPR LONG
/ PROJECT LDR EETS (L)
EISENHUT FILE & REGION (3)
LAIN AS
/St. Mary WILLI AMS (E)
MORRIS B E N A RO A H AR LESS WILSON (L)
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EXTERNAL DISTRIBUTION
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1 ASLB A - W. PENNINGTON, Rm E-201 GT 1 - G. U LRlKSON, ORN L 1 - Newton Anderson 1 - B&M SWINEBROAD, Rm E-201 GT 1 - AGMED (RUTH GUSSMAN) 16 - ACRS HOLDING 1 - CONSU LTANTS Rm B-127 GT NEWM AR K/B LUM E/AG B ABI AN 1 - R. D. MUELLER, Rm E-201 GT S
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GQL 0378 Regulatcry File C3 c (, ~,'
l s i,7 tip.
(/ ". s, A A Mr. J. P. O'Reilly, Director
/g'. f.
O/f Regulatory Operations - Region 1 U.S. Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 N '-.
Dear Mr. O'Reilly:
Operating License DPR-50 Docket No. 50-289 In accordance with the Environmental Technical Specifications for our Three Mile Island Nuclear Station, Unit 1, we are reporting the following Environmental Incident :
(1) Reporting Number:
E.I. 50-289/74-10 (2a) Reporting Date: October 4,19 74.
(2b) Occurrence Date: September 29, 1974.
(3) Facility : Three Mile Island Nuclear Station, Unit 1 (4) Identification of Incident:
pH values outside the allowable range for four Waste Neu ralizing Tank releases, which is a violation of the Environmental Technical Specifications, paragraph 2.2.3, and constitutes exceeding a Limiting Condition for Operation.
(5) Conditions Prior to Occurrence:
The reactor was at steady state power with major plant parameters as follows:
g 't C
,e 'N Power: Core:
100% Elec. : 860 MW (Gross)
/,
/j y
Vb RC Flow:
140 x 106 lb /hr y,N DJ l' \\.
RC Pressure: 2155 psig CCJJ gg, ]kh>2 I
+ mm~
'm 1082d 9
m._
RC Temp. : 579 F PRZR Level: 240 in PRZR Temp. : 6450F (6) Description of Incident:
Prior to discharging from the Waste Neutralizer Tank on August 31, and September 15, 20, and 23,1974, installed ins trumentation was used to monitor the pH of the tank contents in accordance with the requirements of the Environmental Technical Specifications ;
and the readings all indicated to be within the specification limit of 6.0 to 9.0.
In addition to using the installed ins trumer.tation, laboratory samples were also taken prior to each release in question, and subsequent analysis indicatad pH values of 9.20, 5.84,11.41, and 10.10 respectively.
(7)
Designation of Apparent Cause of Incident :
It has been determined that the primary cause of the incidents was an intermittent equipment malfunction of the installed pH instrumentation for the Waste Neutralizing Tank; and that previous weekly checks of the Lautrwment against a standard buffer solution failed to uncover the problem because of its intermittent nature.
(8) Analysis of Incident:
It is believed that the four Waste Neutralizing Tank releases under discussion did not cause any environmental damage and did not represent a threat to either the health or safety of the public in that the pH of the combined River Water Discharge during each release was well within the Environmental Technical Specification limits.
(9) Corrective Action:
The following immediate corrective actions were taken:
a.
The f aulty e ponents of the installed pH instrumentation were replaced, b.
Plant Operations personnel and the Radiation Chemistry Technicians were advised that henceforth samples would have to be collected from the Waste Neutralizing Tank and analyzed before the tank could be drained.
In a meeting held inmediately af ter the incidents were.
reported, the Plant Operations Review Committee (PORC) reviewed and gave its approval of these actions. In addition, they recommended to the Station Superintendent that the following long-term corrective actions be taken:
1482 011
a.
Calibrate the i,talled pH instrumentation on a monthly basis, b.
Issue a problem report whenever it is determined from the monthly calibrations that the installed instrumentation is drif ting or is performing unreliably, Revise the procedure for draining the Waste Neutralizing Tank c.
to require 1) that the tank be sampled and the samples analy::d for pH prior to tank release, 2) that the tank not be drained if the samples have pH values outside of the 6.0 to 9.0 range, and 3) that the Shif t Supervisor be notified at once of any such outside-of-range values.
The Station Superintendent ccacurred with PORC's recommendation, and nas taken steps to ensure their implementation.
(10) Failure Data:
a.
Previous Failures: None b.
Equipment Identification:
Foxboro pH-to-Current Transmitter, Model 699 Sincerely,
'ne /7 C. A(rnoldkd-t ', ' 2+ '-
\\ \\s K.
Vice President RCA/JFV/cas File:
20.1.1/ 7.7.3.11.1 cc: Director Directorate of Licensing U.S. Atomic Energy Commission Washington, D.C.
20545 l482 012
.