ML19221A997
| ML19221A997 | |
| Person / Time | |
|---|---|
| Issue date: | 03/31/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| References | |
| NUREG-75-087, NUREG-75-087-06.5.1, NUREG-75-87, NUREG-75-87-6.5.1, SRP-06.05.01, SRP-6.05.01, NUDOCS 7907120157 | |
| Download: ML19221A997 (7) | |
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STANDARD REVIEW PLAN WE
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OFFICE OF NUCLEAR REACTOR REGULATIOld SECTICN 6.5.1 ESF ATMOSPHERE CLEANUP SYSTEMS REVIEW RESPONSIBILITIES Primary - E f fluent ireatment Systems Branch (ETSB)
Secondary - Accident Analysis Branch (AAB) l I.
AREAS OF REVIEW At the construction permit (CP) stage of review, Ei3B reviews the information in the applicant's safety analysis report (SAR) in the areas listed below. At the operating license (OL) stage, the ET58 review consists of conficming tne design accepted at the CP stage and evaluating the adequacy of the applicant's technical specifications in these areas.
The specific review areas are as follows:
1.
The engineered safety feature (ESF) atmosphere cleanup systems designed for l
fission product removal in post-accident environmentr These generally include primary systems, e.g., recirculation (in-containment), and secondary systems, including standby gas treatment syste.ms and the emergency air cleaning systems for the fuel handling building, control room, and shield ta ding and areas containing engineered safety feature components.
2.
The system design, design objectives and design criteria. The ETSB reviews the methods of operation and the factors that influen a the filtration capabilities of the system, e.g., system interfaces and potential bypass routes. The components included in each atmospheric cleanup system and the seismic design categ~y of each system are reviewed. Redundancy of tho atmosphere cleanup systams, the physical separation of the redundant trains, and the volumetric air flow rate of each train are reviewed.
e 3.
The environmental design criteria, the d^ sign pressure and pressure differential, relative humidity, maximum and minimum temperature, radiation source term, and l
the shielding of essential services such as power and electrical control caH es dssociated with the 3tmosphere cleanup systems.
4.
The coronent design criteria and qt lification testing, qualification requirements of demisters, prefilters, and high ef ficiency particulate air (HEPA) filters, gri re juirements of the filter and adsorber mounting frames, system filter sings, and water drains, the adsorbent used for removal of gaseous iodine _
a the prel'minary safety analysis report, PSAR), the physical properties of USNRC STANDARD REVIEW PLAN Stender 4 ce *ew piene are prooered for the evidence of e*
o++ ice of Nacieer Reactor Revoienen otoff responesbie for the revlow of appe6cesione to constr ct.r d operate nwe ser power p4 ente These documente are mede eveelebee to the pwbl6c es part of the Commseason e polecy to inform the nucdear 6ndustry and the 9
generet put 4c of regulatory proceduees ace 3,4ec6ee Standard review piene are not owbotetutwo for regwie~ory guedes or the Comenssoson a regudetoons end contp44enCe M*th them te %t required The senderd row,ew pien sectione are ho ed to Revieson 2 of the Stendeed Formet end Centent of Safety Anahese Repone v
for Nveteer *ower Plante Not oil er.teone of the Sions wd Formes have e correopend6ng review pean Pub 6sehed a endard rewtow plane west be rev6eed pertodicotty as oppropatete. to accommodate cornmenee end t, regioc, %,w enformetson and espertence Commente a to sus asettone for 6mprovernent ertet be coneeder ed end enou64 be sent to the U $ Nocteer Regwtaiory Commession.Offwe of Noriese Reector Reguletten. Meehington D C. 235 Pev. 1 79(v;"M0 W jf7 74]
the adsorbent and the design of the adsorber section of the filter trains (in the final safety analysis report, FSAR). Provisions to inhibit offdesign temperc tures in the adsorber section and the design criteria of the system fans or blowers, ductwork, and housings are also reviewed.
5.
Design provlsions incorporated in the equipment and features to facilitate operation and maintenance. The design of doors to the filter housings, the spacing of componen*, alignment and support of filter elecents, the spacing of filter elements in the same bank, design of test probes, and provisions for adequate lighting ir. the filter housing are also reviewed.
6.
The design criteria for inpiace testing of the air flow distribution to the HEPA filters, dioctyl phthalate (DOP) testing of the HEPA filter sections, and gaseous halogenated hydrocarbon refrigera.t testing of the activated carbon adsorber section.
7.
The laboratory testing criteria for the activated carbon adsorbent, qualification and batch tests, provisions 4 r cbtaining representative adsorbent samples for laboratory testing in order to estimate the amo n t of penetration of the system adsorbent throughout its service life (PSAR), and the provisions and conditions for each field and laboratory test (FSAR).
l The review of the ESF atmosphere cleanup systems involves secondary review evaluations performed by other branches. The conclusions from their evaluations on request are used by ETSB to complete the overall evaluation of the facility. The evaluations provided by tne branches are as follows:
ICSB reviews the associated instrumentation including the power supply and electrical l
distribution systems under SRP Sections 3.11, 7.3, 7.5, and 8.2; AAB calculates the l
doses that result as a consequence of postulated accidents urder the SRP for f,hapters 6, 9, and 15 of the SAR.
II.
ACCEPTANCE CRITERIA The installed ESr atmosphere cleanup system is needed to mitigate the consequences l
of postulated accidents by removing from the atmosphere radioactive material that may be released in the event of an accident. ETSB will accept ESF atmosphere cleanup l
systems if the following criteria are met:
1.
Atmosphere cleanup systems should be designed 50 that they can operate afte' l
design basis accidnts (DBA) and retain radioactive material af ter th CBA 2.
r'or the system design, ETSB will use the following guidelines for determining acceptability:
Rev. I 6.5.1-2 147 342
a.
Each atmosphere cleanup system should be able to prefilter the air, remove l
noisture ahead of charcoal adsorbers, and remove particulate matter by HEPA 9
filters before and after the charcoal adsorbers.
b.
Redundancy of filter systems should be provided, with the trains physically l
separated so that da~nage to one system will not cause damage to the other system.
c.
All components should be designated as seismic Category I.
l d.
Individual systems should be limited to a volumetric air flow rate of 30,000 l
cfm.
Each system should be instrumented to signal, alarm, and record pressure drop l
e.
and flow rate at the control room.
f.
The applicable ESF atmosphere cleanup systems should be automatically activated after a UBA unless (1) the atmosphere cleanup system is operating during the time the DBA accurs, or (2) the activation is the result of another ESF signal (i.e., temperature, pressuce).
3.
For environmental design, ETSB will use the following guidelines to determine acceptabi1i'y:
a.
Expected conditicns for the filter system, including maximum pressure and pressuredifferential,radiationdoseratereceivedbythecomponents, relative l humidity, and maximum and minimum temperature should be based on the conditions in a postulated DBA.
b.
The radiation source terms should be consistent with the guidelines in Regulatory Gui des 1. 3, 1. 4, and 1. 25.
c.
Shielding should be provided for essential servicec such as power and electrical control cables associated with the atmosphere cleanup system.
4.
For component design and qualification testing, ETSB will use the fn!1uwing guidelines to determine acceptability:
a.
The demisters should be designed, constructed and tested in accordance with tie l recommendations of Section 5.4 of ANSI N509-1976 (Ref. 6) and meet the l
Underwriters' Laboratory (UL) Cla s 1 requirements (Ref. 8).
b.
Moisture removal equipment should be capable of reducing the relative humidity of the incoming atmosphere from 100% to 70%.*
- Air heaters sho3 d be designed, constructed and testad in accordance with the recom-l mandations of Section 5.5 of ANSI N509-1976 (Ref. 6).
}kf )k Rev. 1 6.5.1-1
c.
If prefilters are provided, they should be designed, constructed and tested in accordance with the recommendations or Sec+ ion 5.3 of ANSI N509-1976 (Ref. 6).
d.
HEFA filters should t,e des.g. led, constructed and tested in accordance with Section 5.1 of ANSI N509-1976 (Ref. 6).
e.
Filter and adsorber mounting frames should be designed, arranged, and constructed in ai rdance with the recommendations of Section 5.6.3 of ANSI N509-1976 (Ref. l 6).
f.
Filter housings, including floors and doors, should be o signed and constructed in accordance with the recommendations of Sectico 3.6 of \\NSI N509-1976 (Ref.
6).
g.
Water drains should be designed in accordance with the recommendations of Section 4.5.8 of ERDA 76-21 (Ref. 7).
l h.
The adsorbent to be used for adsorbing gaseous iodine (elemental sdine and organic iodidas) should be an adsorbent that has been demonstrated to remove the gaseous iodines from air at the required efficiencies referenced in ANSI l
N509-1976. If impregnated activated charcoal is the adsoru?, the physical properties of the adsorbent should be in accordance with the guidelines of ANSI N509-1976 (Ref. 6).
If an adsorbent other than irrpregnated at tivated charcoal l is proposed, ETSB will review supporting data and accept adsorbents expected to perform equal to, or better than, impregnated activated charcoal, i.
The adsorption unit should be designed for a maximum loading of 2.5 mg of total l iodine (radioactive plus stable) per gram of activated charcoal.
j.
Provis ons should be included to inhibit off-design temperatures in the adsorber section.
To dissipate heat generated from iodine decay and charcoal oxidation effects, ETSB will consider cooling mechanisms such as low flow air bleed systems ano cooling coils. To extinguish ignited charcoal, ETSB will consider water sprays, carbon dioxide injection systems, and liquid nitrogen cooling systems.
k.
The system fan, its mouncing, and ductwork connections should be designed, constructedandtestedinaccordancewiththerecommendationsofSection5.7andl 5.8 of ANSI N509-1976 (Ref. 6).
1.
Ductwork should be designed, to tructed and tested in accordance witi the recommendations of Section 5.10 of ANSI N509-1975 (Ref 6).
Rev. 1 6.5.1-4 14/ M4
m.
Dampers should be designed, constructed and tested in accordance with the recommendations of Section 5.9 of ANSI N509-1976 (Ref. 6).
5.
ETSB will accept ESF filter systems that are designed for accessibility of components and ease of maintenance in accordance with the recommendations of Section 2.5 of ERDA 76-21 (Ref. 7) and Section 4.0 of ANSJ N509-1976 (Ref. 61 as follows:
l a.
Components should be provided with a minimum of three linear feet from mounting frame to mounting frame between banks of components; components to be replaced should be provided with a minimum of three linear feet plus the maximum length of the component.
b.
Provisions should be made for permanent test probes with external connections in accordance with the recommendations of Section 4.11 of ANSI N509 (Ref. 6).
l 6.
For in plar Lesting, ETSB will use the following guidelines for determining accep; ability:
a.
Provisions should be made for visual inspection of the sy tem and all associated components in accordance with the recommendaticns of Section 5 of ANSI N510 (Ref. 5).
b.
Provisions should be made for testing the air flow distribution upstream of HEPA 9
filters and charcoal adsorbers, and demonstrating uniformity + 20% of averaged flow per unit.
c.
Provisions stnuld be made for DOP testing
.f the HEPA filter sections in accordance with the recommendations of ANSI N510 (Ref. 5).
d.
Provisions should be made for leak-testing the activated carbon adsor;;er section with a gasoous halogenated hydrocarbon refrigerant in accordance with the recommendetions of ANSI NE10 (Ref. 5).
e.
Provisions should be made for in place testing initially, and routinely theieafter. Frequency and testing requirements will be established in the technical specifications.
7.
For laboratory testing of activated carbon adsorbent, ETSB will use the following guidelines for determining acceptability:
a.
Qualification and batch tests on new unused adsorbent should be performed in accordance with the guidelines of ANSI N509-1976 (Ref. 6).
147 345 6.5.1-5 Re v.
I
b.
Provisions should be made for obtaining representative adsorbent samples in order to estimate the amount of penetration of the sy stem adsorbent throughout its service life (PSAR).
c.
Provisions should be made for laboratory _esting initially, and routinely thereafter. Irequency and testing requirements will be established in the technical specifi:ations.
ETSB will accept the following deviations from the above acceptance criteria for the post loss-of-coolant accident (LOCA) hydrogen purge filtration system:
1.
If the calculated dose (sum of the long term doses from the LOCA and the purge dose at the Icw population zone outo boundary) is less than the guidelines of 10 CFR Part 100, no filtration system is required.
2.
If a radiciodine decontamination factor of 10 or less is needed for the calculated dose to be below Part 100, an ataosphere cleanup system that meets l the acceptance criteria listed in Item 5 of Acceptance Critcria in SRP Section 11.3 should be provided.
3.
If a radiciodine decontamination factor of greater than 10 is needed for the calcu'ated dose to be below P3rt 100, the atmosphere cleanup system l
should meet all of the above acceptance criteria, except for Items 2b and 2c.
III. REVIEW PROCEDURES The reviewer will select and emphasize material from this review plan, as tray be appropriate for a particular case.
1.
In the ETSB review the plant design is reviewed to determine where ESF units are needed.
2.
The ETSB review is carried out by making a detailed comparison of atmosphere
{
cleanup system designs with tr,e acceptance criteria of Section II, above. The capability of a system to remove ficsion products in the atmosphere after a DBA is reviewed, based on a design loading of 2.5 mg of total iodine (radioactive plus stable) per gram of activated charcoal adsorbent. Designs consistent with the guidelines of Regulatory Guide 1.52 will be assigned the system efficiencies for removal of elemental iodine and organic iodides given in Table 2 of Regulatory Guide 1.52 and a system ef ficiency of 974 for removal of particulates resulting from a DBA. The assigned ef ficiencies are for Accident Analysis Branch u< e in accident analyses to calculate offsite doses to the whole body and thyro 1 9
}kf kb Rev. 1 6.5.1-6
IV.
EVALUATION FINDINGS ETSB verifies that sufficient information has been provided and that the review is adequate to support conclusions of the following type, to be included in the staff's 9
safety evaluation report:
"The ESF atmosphere cleanup systems include the equipment and instrumentation to control the release of radioactive materials in gaseous effluents following a postulit2d design basis accident. The scope of our review included an evaluation of these systems with respect to tha guidelines of Regulatory Guide 1.52.
We have reviewed the applicant's system descriptions and design critcria for 'he l
ESF atmosphere cleanup systems. The basis for acceptance in our review no. been conformance of the applicant's designs, design criteria, and design t'ses for the ESF atmosphere cleanup systerns to applicable regulations, guides and industry l
standards. Based on our evaluation, we find the proposed ESF atmosphere cleanup l
systems are acceptable, and the filter ef ficiencies given in Table 2 of Regulatory Guide 1.52 are appropriate for use in accident analyses."
V.
REFERENCES 1.
Regulatory Guide 1.3, " Assumptions Used for Evaluating the Potential Radiological Consequences of a loss-of-Coolant Accident for Beiling Water Reactors."
2 Regulatory Guide 1.4, "Assumptiors Used for Evaluating the Potential Radiological Consequences cf a Loss-of-Coolant A aident for Pressurized Water Reactors."
3.
Regulatory Guide 1 25, " Assumptions Used for Evaluating the Potential Radiological Ccnsequences of a 'cel Handling Accident in the Fuel Handling and Storage Facility for Eoiling nd Pressurized Water Reactors."
4.
Regulatory Guide 1.52, " Design, Testing, and Maintenance Criteria for Post Accident Engineered-Safety-Feature Atmosphere Cleanup System Air Filtration and Adsorption Units of Light-Water-Cooled Nuclear Power Plants. "
5.
ANSI N510 " Testing oi Nuclear Air Cleaning System," American National Standards Institute (1975).
e.
ANSI N509, " Nuclear Power Plant Air Cleaning Units and Components," American l
National Standards Institute (1976).
7.
f2DA 76-21, " Nuclear Air Cleaning Handtook," Oak Ridge National Laboratory, l
C. A. Burchsted, I. E. Kahn and A. B. Sller, March 31, 19/6.
8.
" Building Material; List,"
Underwriters' Laboratorie;, Inc.
itt7 347 6.5.1-7 Rev. I