ML18081B059
| ML18081B059 | |
| Person / Time | |
|---|---|
| Site: | Salem  |
| Issue date: | 01/31/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML18081B055 | List: |
| References | |
| NUDOCS 8002190162 | |
| Download: ML18081B059 (2) | |
Text
r ENCLOSURE EVALUATION OF SALEM NUCLEAR GENERATING STATION, UNIT 2 SECONDARY MATER CHEMISTRY PROGRAM DOCKET NO. 50-311 In a letter dated July 31, 1979, the app1Jc9-nt YJ!iS_ r:equ?ste_d to __ i_mplen:l?nt a secondary,watEfr chem-i stry in6nitor1ng and control program that included the following:
1.. Identification of a sampling schedule for the critical parameters and of control points for these parameters;
- 2.
Identification of the procedures used to measure the value of the critical parameters;
- 3.
Identification of process sampling points;
- 4.
Procedure for the recording and management of data;
- 5.
Procedures defining corrective actions for off-control point chemistry conditions; and
- 6.
A procedure identifying (1) the authority responsible for the interpre-tation of the data and (2) the sequence and timing of administrative events required to initiate corrective action.
In a letter dated December 6, 1979, the applicant has stated that all volatile chemical treatment (AVT) of secondary water systems for control of dissolved oxygen and corrosion of ferritic metals and copper alloys will be used.
Chemical treatment along with operation of condensate polishing and steam generator blowdown systems and a maintenance program will be used to control the sources of secondary contamination (raw water inleakage across the condenser tubes, and air inleakage into the system). A sampling and analyses program in conjunction with inline monitors will provide the means of detecting and cor-recting out-of-limit chemi~try conditions.
Procedures will be instituted to provide instructions for the prompt notification of responsible plant personnel of out-of-limit secondary system chemistry and the steps to be taken to correct the situation.
Records will be kept and maintained pertaining to secondary water chemistry to be used for evaluating past conditions in relation to possible subsequent operations.
300219*0
(~-- 2 __ _, __
- We find these provisions to be acceptable, however, in addition to the proposed secondary water chemistry monitoring and control program, we will require the applicant to monitor the steam condensate at the effluent of the condensate pump.
The monitoring of the condensate is for the purpose of detecting condenser leakage.
When a condenser leak is confirmed, the leak should be repaired or plugged within 96 hours0.00111 days <br />0.0267 hours <br />1.587302e-4 weeks <br />3.6528e-5 months <br />, as stated in the Branch Technical Position MTEB 5-3 appended to Standard Review Plan 5.4.2.1.
It should be noted that the steam generators of the Salem Generating Station, Unit No. 2 are of a design having carbon steel supporting plates with drilled flow holes.
Steam generators of this design in operating plants have experienced denting and cracking. Although an effective secondary water chemistry control program can reduce the rate of tube degradation there is no assurance that a 40 year steam generator lifetime can be obtained.
Although the possibility of tube cracking exists, we have concluded that operation of the steam generators will not constitute an undue risk to the health and safety of the public for the following reasons:
- 1.
Primary to secondary 1 eakage rate 1 imits, and associated survei 11 ance requirements will be established to provide assurance that the occurrence
- of tube cracking during operation will be detected and appropriate corrective action, such as tube plugging, will be taken such that any individual crack present will not become unstable under normal operating, transient or accident conditions.
- 2.
Augmented inservice inspection requirements and preventative tube plugging criteria will be established to provide assurance that the great majority of degraded tubes will be identified and removed from service before leakage develops.