ML20041E642
| ML20041E642 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 03/05/1982 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Miraglia F Office of Nuclear Reactor Regulation |
| References | |
| SBN-221, NUDOCS 8203110206 | |
| Download: ML20041E642 (7) | |
Text
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SEAN N S W lON I PUBLIC SEAVICE Engineering Office:
Companyof NewHampsNce 1671 Worcester Road Framinohom Massachusetts 01701 (617) - 872 - 8100 t%
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Ma rc h 5, 1982 8
s RECE4VED 5
SBN-221 1
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United States Nuclear Regulatory Commission E,
Washington, D. C. 20555
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Attention:
Mr. Frank J. Miraglia, Chief Licensing Branch #3 jfvision of Licensing Re f e re nc e s :
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) USNRC Let ter, da ted Janua ry 12, 1982, " Requests for Additional Information Seabrook Station," F. J. Miraglia to W. C. Tallman Su bj ec t :
Response to 282 Series RAIs (Chemical Engineering Branch; Corrosion Engineering Section)
Dear Sir:
We have attached responses to the subject RAIs which you forwarded in Re f e re nc e (b).
Very t ruly yours, YANKEE ATOMIC ELECTRIC COMPANY m) sjt,..WclW(U' J. DeVincentis Project Manager JDV: ALL: dad Attachments Ok
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8203110206 820305 PDR ADOCK 05000443 A
282.1 The inf ormation you have provided is insuf ficient for us to (9.1.2) evaluate the compatibility and chemical stability of materials wetted by the pool water, and in addition, to determine that there are no potential mechanisms that will:
- 1) alter the dispersion of the strong fixed neutron absorbers incorporated into the storage racks and/or 2) cause physical distortion of the tubes retained in the stored fuel assemblics.
Provide a summary of the materials used in constructing the spent fuel storage pool, the water chemistry, and any materials monitoring program that might be proposed addressing the f ollowing:
1.
Proposed water chemistry limits for the spent fuel storage pool.
2.
Proposed san.piing and purification techniques for maintaining the chemistry within design limits.
3.
The nature of the materials used in the spent fuel storage pool including the racks, the liner, and the nucicar absorbers.
RESPO!1SE :
1.
Pa ramet e r Specification pli Determined by boric acid concentration - expected 4.0 to 4.7 Fluo rid e 0.15 ppm, maximum Chloride
'J.15 ppm, maximum Ca lcium 1.0 ppm, maximum Magnesium 1.0 ppm, maximum
-:n a
Boron 2000 ppm, minimum 2.
Procedures are being developed for the station chemistry program and will be completed and implemented three months prior to fuel load. The sampling schedule will closely follow that recommended by NSSS Vendor in Westinghouse Standard Information Package 5-1, Chemistry Criteria and i
Specifications, which recommends a weekly surveillance of those parameters identified in 1.0 above.
Purification will be achieved by a dedicated demineralizer
)
containing mixed bed resin.
Filtering is achieved with pre-and post-f on exchange filters.
Purification performance will be monitored by observing water chemistry and by isotopic l
l analysis across the demineralizer.
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3.
Kiterials used in the spent fuel racks are:
Rack Assembly: Cans A-240 Type 304 Crids A-240 Type 304 Foot Assembly 17-4 Pil SS, A564 Cr 630 - 304L SS, A193 SS Liner:
Stainless Steel Poison:
Boraflex - a borated composition comprised of a polymeric silicone encapsulent entraining and fixing fine particles of boron carbide in a homogeneous, stable matrix. The boron carbide powder meets all the requirements of ASTM C-750-74 nuclear grade II material.
See Brand Industrial Services Report 748-30-1 for add itional information.
wn e,r m_,
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282.2 The information you have provided is insuf ficient for us to (10.3.5) evaluate the secondary water chemistry control program. Provide a summary of operative procedures to be used for the steam generator secondary water chemistry control and monitoring program, addressing the following:
1.
Sami. ling f requency for the critical chemical and other parameters and of control points or limits for these parameters for each mode of operation: normal operation, hot startup, cold startup, hot shutdown, cold wet layup.
2.
Procedures used to measure the values of the critical parameters.
3.
Location of process sampling points.
4.
Procedure for the recording and management of data.
5.
Procedures defining corrective actions
- for off-control point chemistry conditions detailing time allowed at of f-chemistry conditions.
6.
The procedure identifying (a) the authority responsible for interpretation of the data and (b) the sequence and timing of administrative events required to initiate corrective action.
RESPONSE
1.
Procedures are being developed on this subject and will be completed for implementation three months prior to fuel load.
The sampling schedule is expected to closely follow the recommendation of the NSSS Vendor specified in the Westinghouse Standard Information Package 5-4, Steam Side Water Chemistry Control Specifications. Critical parameters and specifications for each mode of operation are listed on the attached table.
2.
Procedures are being developed for chemical analysis of critical parameters and will be completed for implementation three months prior to fuel load. Procedures will be developed using references such as:
American Public Ilealth Association, Standard Methods for Examination of Water and Wastewater.
American Society for Testing Materials, Part 31 Water.
Westinghouse Standard Information Package 5-2, Chemical Analysis Procedures.
3.
Locations for process instrumentation and sample points are indicated on FSAR Figure 9.3-6.
The extensive process instrumentation which monitors critical parameters of the secondary system will result in continuous assessment of the secondary system. Grab samples will also be taken at critical points (i.e., blowdown, feedwater, condensate, and make-up) as additional verification of system chemistry 9
f control.
4.
Procedures are being developed and will be completed three months prior to fuel load. Seabrook Station will have qualified chemistry personnel on station at all times to interpret analysis data of critical parameters on a continuous basis, followed by additional technical review by chemistry department management during normal work hours.
All analysis records will be maintained in accordance with station administrative procedures.
5.
Procedures for dafining corrective action are being developed and will be completed three months prior to fuel load.
Procedures will be predicated en the need to maintain -
condenser integrity by using state-of-the-art techniques f or Icak detection such as helium-nass spectroscopy to identify air and seawater intrusion.
Process instrumentation will result in rapid identification of leak at Seabrook. Special design features enhance the capability to detect leaks such as a catch trough on the tube sheets with a continuous conductivity measurement. Corrective action to repair a verified condenser seawater intrusion in excess of the NSSS chemistry control parameters will be accomplished within ninety-six hours per Branch Technical Position MTEB 5-3.
Corrective actions will also be taken to limit the chloride concentration in the steam generator blowdown to 150 ppb during normal operation.
5.
The Seabrook shif t chemistry technician is the primary individual responsible to interpret operational chemistry i
4 i
d a ta.
Shif t chemistry technicians will have completed all training required by'che non-licensed training program for chemistry technicians giving them the expertise to advise the Unit Shift Supervisor on, operational chemistry occurrences.
Procedures are being developed regarding the administrative processing of enemistry data and shall be completed three months prior to fuel load.
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Critical Parameters and Specifications for each Mode of Operation T
Parameter Vet Lay-Up Hot Shutdown Cold Start-Up - Hot Start-Up Normal Operation Blowdown Blowdown Feedwater Blowdown Feedwater Blowdown pH 250C 10.0-10.5 8.8-10.0 8.8-10.0 8.5-10.0 8.8-9.2 8.5-9.0 Free Hydro-xide as ppm CACO 3 N/A
.15 max.
N/A
.15 max.
N/A
.15 max.
Cation Con-ductivity umhos/cm ISOC N/A 2.0 max.
N/A 7 max.
N/A 2 max.
Chloride ppm
.5 max N/A N/A N/A N/A
.15 max.
Hydrazine ppm 75-150 N/A
[0 ] +.005 N/A
[0 ] +.005 N/A 2
2 Dissolved oxygen ppb 100 max.
N/A 100 max.
N/A 5 max.
N/A
282.3 Veri fy that the steam generator secondary water chemistry program (10.3.5) incorporates technical recommendations of the NSSS. Any significant deviation f rom NSSS recommendations should be noted and justified technically.
RESPONSC:
The Westinghouse NSSS Chemistry Manuals will be the basis for the secondary system chemistry control program.
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