ML19221B083
| ML19221B083 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-10.4.1, NUREG-75-87, NUREG-75-87-10.4.1, SRP-10.04.01, NUDOCS 7907120389 | |
| Download: ML19221B083 (4) | |
Text
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STANDARD REV EW PLAN
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OFFICE OF NUCLEAR REACTOR REGULATION SECTICN 10.4.1 MAIN CONDENSER 5 REVIEW Rf SFCNSIBilIIIES I
Primiry - Power Systems Branch (PSB)
Secondary - Effluent Treatment Systems Pranch (EISB)
Materials Engineering Branch (MTEC)
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1.
AREAS CF REVIEW The main condenser (MC) system is designed to condense and deaerate the enh3ust steam frnm the main turbine and provide a heat sink for the turbine bypass system.
1.
The P5B reviews the performance requirements of the main condenser for both direct l
3nd indirect cycle plants during all operating conditions Emrhasis will be placed on the review of direct cycle facilities with regard to the prevention of loss of vacuum, corrosion and/or erosicn, and hydrogen buildsp.
l 2
The P5B reviews the design of the MC system with respect to the following:
l The means to detect, control and faci!itate correction cf the leu age of coaling l a.
water into tiie cond,*nsate; to detect radioactive leakage into or out of the system; and to preclude accidental releases of radioactise materials to the environment in amounts in excess of established limits.
b.
Instru.tentation and control features that determine and verify th
'e MC is operating in a correct mode.
c.
The means provided to deal with flooding from a complete failure of the MC and to preclude damage to safety related equipment from the flooding.
d.
The capability
, MC to withstand the blowdown effects of steam from the turbine bypass sy...a.
Secondary reviews are performed by other branches and the results usej by the PSB te l
complete the overall evaluation of the system. The secondary reviews are as follows.
The ETSB evaluates the inventory of radioactive contaminants in the MC during power cperation and Juring shutdown. The MIEB evaluates the adequacy of the materials of c o n s t ruc t i e,1, the methods used to reduce the cerrosion and/or erosion of MC tubes and USNRC STANDARD REVIEW PLAN s,.aa., 4.
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components, the permissible cooling water inleakage, and the allowed timo of operation with inleakage without affecting condensate /feedwater quality for safe reactor operation.
II.
ACCEPTANCF CRITERIA There are no General Design Criteria that directly apply to the main condenser.
l Acceptatility of the design of the main condenser system, as described in the applicant's safety.nalysis repcrt (SAR), is based on the system being designed such that failures do not cause unacceptable ccndensate quality, flooding of areas housing safety related i
equipa nt, or result in excessive releases of radioactivity to the environment. Additional bases 'or determining the acceptability of the PC system are the degree of similarity of the design with that of previously reviewed plants with satisfactory operating experience, and R2;,ulatory Guide 1.68, as related to preoperational and startup testing of the power conversicn system.
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 application are contained in the SRP sections corresponding to those branches.
III. REVIEW PROCEDURES The pr'ceduces below are used during the construction permit (CP) review to determine that the design criteria and bases and the preliminary design meet the acceptance criteria given in subsection II.
For the review of operating license (0L) applications, the procedures are used to verify that the initial design criteria and bases have been appro-priately implemented in the final design as set forth in the final safety analysis report.
The reviewer will select and emphasize material from this SRP section as may be appropriate for a particular case.
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.
1.
The SAR is reviewed to determine that the system description delineates the main condenser system capabilities including the minimum system heat transfer and system flow requirements for normal plant and turbine bypass operation. Measures provided to prevent loss of vacuum, corrosion and/or erosion of MC tubes and components, and l
hydrogen buildup in the MC are reviewed, with particular emphasis on these measures for direct cycle (boiling water reactor) plants. System performance requirements are reviewed to determine that they satisfactorily limit possible system degradation conditions (e.g., leakage, partial loss of vacuum) and describe the procedures that are followed to detect and correct these conditions. The SAR is also reviewed to determine that any allowed MC system degraded operation does not have an adverse ef fect on the reactor primary system or secondary system in the case of pressurized l
water reactors.
ita 090 Rev. I 10.4.1-2
2.
The reviewer evaluates the MC system design to verify that:
a.
Means have been provided for detecting, controlling and correcting condenser cooling water leakage into the condensate.
b.
The permissible cooling water inleakage and time of operation with i nl ea k ac,e l
are provided to assure that condensate /feedwater quality can be maintained within safe limits, c.
Measures have been provided to detect radioactive leakage into and out of the MC system and to preclude unacceptable accidental releases of radioactivity to the environment from the system.
d.
The system is provided with instrumentation and control features that determine and verify that the MC is operating in a correct mode.
3.
The reviewer uses engineering judgment and the results of fai Nre modes and etfects analyses to determine that:
The failure of a main condenser and the resulting flooding will not preclude a.
operation of any essential systems. Reference to sections of the SAR describing plant features and the general arrangement and layout drawings will be necessary, as well as the SAR tabulation of seismic design classifications for structures and systems Statements in the SAR that verify that the above conditions are met are acceptable.
b.
lhe system, in conjunction with the main steam system, has provisions to detect loss of condenser vacuum and to effect isolation of the steam source. For direct cycle plants, it will be acceptable if the detection system in the MC can actuate the main steam isolation valves to limit the quantity of steam lost from the condenser.
Design provisions have been incorporated into the MC that will preclude component c.
or tube failures due to steam blowdown from the turbine bypass system.
IV.
EVALUATION FINDINGS The reviewer verifies that sufficient information has been provided and his review supports conclusions of the following type, to be included in the staf f's safety evaluation report:
"The main condenser system includes all components and equipment from the turbine exha.
to the colnections and interfaces with the main condensate and other systems.
The ape of review of the main condenser system for the plant included layout dr3 wings, piping and instrumentation diagrams, and descriptive information for the main condenser system and supporting systems that are essential to its operation. [The review has determined the adequacy of the applicant's proposed design criteria and bases for the main condenser system and the requirements to
\\hj 10.4.1-3 Rev. 1
preclude safety-related equipment nalfunctions or failures due to rupture of the main condensers. (CP)] [The review has determined that the design of the m3in cnndenser system and supporting systems is in conformance with the proposed design criteria and design bases.
(0L)]
6 "The bisis for acceptance in the staff review has been conformance of the applicant's desiqq critoria and design bases for the main condenser system and supporting systems to applicable regulations, staff technical positions and industry j standards.
"The staff concludes that the design of the main condenser system tonforms to all applicable regulations, staff positions and industry standards, and is acceptable."
l V.
REFERENCES 1.
Regulatory Guidc 1.68, " Initial Test Programs for Water-Cooled Reactor Power Plants."
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O Rev. 1 10.4.1-4