ML19221B088
| ML19221B088 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-10.4.5, NUREG-75-87, NUREG-75-87 10.4.5, SRP-10.04.05, SRP-SRP-10.04.05, NUDOCS 7907120402 | |
| Download: ML19221B088 (3) | |
Text
NUREG 75/087 f
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STANDARD REVIEW PLAN
[i U.S. NUCLEAR REGULATORY COMMISSION
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OFFICE OF NUCLEAR REACTOR REGULATION SECTION 10.4.5 CIRCULATING WATER SYSTEM REVIEW RESPONSIBILIT _IES Primary - Auxiliary Systems Branch (ASB)
I Secondary - Instrumentation and Control Systems Branch (ICSB) l Power Systems Branch (PSB)
I.
AREAS OF REVIEW TM circulating water system (CWS) provides a continuous supply of cooling water to the main condenser to remove the heat rejected by the turbine cycle and auxiliary systems.
1.
The A5B reviews the performance of the CWS w;th respect to its functional require-l ments and the effects of adverse environmental occurrences, abnormal operational transients, or accident conditions such as loss of of f site power.
2.
The ASB reviews the CWS and its interfaces with other systems to determine that a malfunction, failure of a component, or failure of a circulating water pipe includ-ing the failure of an expansion joint do not have unacceptable adverse effects on the functional performance capabilities of safety-related systems located in the immediate area.
3.
ASB further reviews the design of the circulating water system with respect to the l
following:
a.
The capability to prevent or detect and control flooding of safety-related areas so that the intended safety function of a safety system or component will not be precluded due to circulating water system leakage.
b.
The compatibility of the methods proposed for control of water chemistry and of long-term corrosion and organic fouling with system components and piping materials.
c.
Provisions for instrumentation to permit operational testing of the system and to annunciate abnormal and unsafe operating conditions.
Secondary reviews are performed by other branches and the results used by the ASB to complete the overall evaluation of the system. The secondary reviews are as follows:
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The ICSB and PSB will, upon request, review the system electrical components, l
instrumentation and controls as they may relate to operations that could effect saf ety related systems or components.
9 II.
ACCEPTANCE CRITERIA Acceptability of the circulating water system. as described in the applicant's safety analysis report (SAR), is based on the criteria below.
There are no general design criteria or regulatory guides that directly apnly to the functional performance requirements for the CW5.
Specific criteria for the CWS are as follows:
1.
Means should be provided to prevent or detect and control flooding of safety-related areas so that the intended safety function of a system or component will not be precluded due to leakage from the CWS.
2.
Malfunction or a failure of a component or piping of the CWS including an expansion joint should nnt h3ve unacceptable adverse effects on the functional performance capabilities of safety related systems or components.
3.
Agents used for the control of water chemistry, corrosion, and crq jnic fouling should be compatible with the miterials of the system.
4.
Branch Technical Positions ASB 3-1 and MEB 3-1, as related to breaks in high and l
moderate energy piping systems outside containment.
for those areas of review identified in subsection I of this SRP section as being the responsibility of other branches, the acceptance criteria and their methods of applica-tion are contained in the SRP sections corresponding to those branches.
III. REVIEW PROCEDURES fhe procedures below are used during the construction permit (CP) review to determine that the design criteria and bases and the preliminary design as set forth in the preliminary safety analysis report meet the acceptance criteria given in subsection II.
l For the review of operating license (OL) applications, the procedures are used to verify that the initial design criteria and bases have been appropriately implemented in the final design as set forth in the final safety an31ysis repc Upon request from the primary reviewer, the secondary review branches will provide input for the areas of review stated in subsection I.
The primary reviewer obtains and uses such input as required to assure that this review procedure is complete.
The revie.ver will select and emphasize material from this SRP section as may be appro-priate for a particular case.
1.
Although the circulating water system i: not safety-related, a failure of this system, or any of its components, may affect a safety-related component er system.
Rev. I
)f}
'03 10.4.5-2 i
Since large quantities of water flow thrcugh the CWS, a leak or break in a compo-nent or pipe or expansion joint failure could cause severe and unacceptable floud-ing of adjacent areas.
In evaluatin7 the effects of the failure of an exp3nsion 9
joint, ASB assumes that the butterfly valve (s) are not available to isolate CWS flow out of the failed espansion joint unless the valve (s) have been designed to safety grade requirements. The ASB reviews tae descriptions and drad ngs in the SAR and determines that provisions are incorporated in the design to prevent unacceptable flooding of areas containing safety-related equipment or to mitigate l
the consequences of flooding.
2.
The ASB reviews the CWS to verify that the capability to detect leaks and secure the system quickly and effectively exists. The reviewer verifies that the design includes provisions to minimize hydraulic transients and their effect upon the functional capability and the integrity of system corponents.
3.
Based on the information contained in the SAR, the reviewer verifies that the applicant's proposed methods for control of water chemistry and of long-term corrosion ard organic f ouling, and the chemical agents used for these purposes are compatible with the systcm materials.
IV.
fvALUATION FINDINGS The reviewer verifies that suf ficient inf ormation has been provided and his review supports conclusions of the following type, to be included in the staff's safety evaluation report:
"The circulating water system includes all components and equipment necessary to provide the main condenser with a continuous supply of coo'ing water.
Based on the review of the applicant's proposed design criteria and bases for the circulat-ing water system, the staff concludes that the decign of the circulating water system is in conformance with the design criteria and design bases.
"fhe basis for acceptance in the staff review has been conformance of the appli-cant's designs, design criteria, and design bases for the circulating water system to applicable staff positions and industry standards.
"The staff concludes that the design of the circulating water system conforms to all applicable staff positions and industry standards, and is accepteble."
V.
REFERENCES Branch Technical Positions ASB 3-1, " Protection Against Postulated Diping Failures in Fluid Systems Outside Containment," attached to SRP Section 3.6.1, and MEb 3-1,
" Postulated Break and teakage Locations in Fluid System Piping Outside Containment,"
attached to SRP Section 3.6.2.
I 149 104 10.4.5-3 Rev. I