ML20058J334

Updated Ro:Liquid Radwaste Treatment Sys Inoperable for More than 31 Days After 820308.New Limiting Condition of Operation Procedure Issued on 820720.Minor Adjustments Made & Sys Rendered Operable on 820726

ML20058J334
Person / Time
Site:	San Onofre
Issue date:	08/02/1982
From:	Ray H SOUTHERN CALIFORNIA EDISON CO.
To:	Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
NUDOCS 8208090233
Download: ML20058J334 (2)

Text

- . .

i ~.

1 .

?

e.

hj?n f

,s, Southern California Edison Company "' ~n ,, SCE S AN ONOFRE NUCLE AR GE lER A TING ST A TION n/ p. .

[f P.O. BOX 128 [-

S AN CLEMENTE. C ALIFORNia 92472 ' N-H.B. RAY r a t s p. EON E ivar.oNo. ...a August 2, 1982 m as"a U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region V 1450 Maria Lane, Suite 210 Wainut Creek, California 94596-5368 Attention: Mr. R. H. Engelken, Regional Administrator

Subject:

Docket No. 50-361 Special Report - Liquid Radwaste Treatment System San Onofre Nuclear Generating Station, Unit 2

Reference:

Letter, H. B. Ray (SCE) to R. H. Engel ken (NRC),

dated July 2, 1982 The referenced letter confirmed our prompt notification of your office of our failure to provide timely reports of our entering Limiting Condition for Operations (LCO) Action Statements per the reporting requirements of applicable Technical Specifications.

Pursuant to Technical Specification 6.9.2 of Appendix A to Operating License NPF-10 for San Onofre Nuclear Generating Station Unit 2, this Special Report is being submitted as required by Technical Specification 3.11.1.3, Action Statement a. This Acilon Statement requires that a Special Report be prepared and submitted to the Commission within 30 days after the Liquid Radwaste Treatment System is inoperable for more than 31 days. This period has been exceeded. The identification of inoperable equipment or subsystems and reasons for inoperability, actions taken to restore inoperable equipment to operable status, and actions taken to prevent recurrence, are outlined below.

On March 8, 1982, with the unit in Mode 6, surveillance testing per Operator Surveillance Test S023-3-3.4, "Radwaste Quarterly Surveillance" was being performed in accordance with Technical Specification 4.11.1.3.2.

After startup.of the miscellaneous waste evaporator, difficulties were encountered in reducing the distillate conductivity. Consequently, the miscellaneous waste evaporator remained in the recirculation mode. As a.

result of this high distillate conductivity, the surveillance testing could not-be completed, thus rendering the system inoperable.

8208090200 EE20802 L _.

gDRADOCK05000

((-[

Mr. R. H. Engelken August 2, 1982 The cause for high distillate conductivity was traced to inadequate venting of volatiles from the condenser. The routing of the vent line causes a loop seal to be formed. During and after shutdown of the miscellaneous waste evaporator, water collects in the loop which impairs venting on restart. If volatiles cannot be vented, they become trapped in the condenser and dissolve in the distillate. As a result, the conductivity of the distillate cannot be reduced to a level that allows its discharge to the water treatment system. This forces the unit to remain recirculation mode and no waste can be processed as a consequence.

The miscellaneous waste evaporator was thoroughly tested in order to f urther confirm this, and any other component problems. Minor adjust-ments were made and the system was rendered operable per Technical Specification 4.11.1.3.2 on July 26, 1982. Design modifications for permanent changes to the system are currently being evaluated.

Corrective action to prevent recurrence of late reporting of LCO Action Statement requirements is the issuance of a new procedure, S023-3-4/30.3, " Generic LCOAR", and training of appropriate personnel in its use. This procedure outlines the steps necessary to implement the Action requirements of the Technical Specifications associated with exceeding the Limiting Condition for Operation. This procedure was issued on July 20, 1982. Additionally, Station Order S023-G-3, " Technical Specification Surveillance Requirements" is currently being revised to include departmental responsibilities for initiating the necessary interface procedures and mechanisms to implement LCO Action Statement requirements as a result of Technical Specification surveillances. 'ihis revision will be released by the end of August, 1982.

There was r.o effect on public health and safety as a result of inoperability of the Liquid Radwaste Treatment System.

If there are any questions regarding the above, please contact me.

Sincerely,

$ w cc: A. E. Chaffee (USNRC Resident inspector, San Onofre Unit 2)