ML20087P481
| ML20087P481 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 03/15/1984 |
| From: | Eisenhut D Office of Nuclear Reactor Regulation |
| To: | BALTIMORE GAS & ELECTRIC CO. |
| Shared Package | |
| ML20087P482 | List: |
| References | |
| NUDOCS 8404090081 | |
| Download: ML20087P481 (8) | |
Text
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c-t Enclosure UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the-Matter of BALTIMORE GAS AND ELECTRIC
)
Docket Nos. 50-317 COMPANY
)
and 50-318 -
i
)
-(Calvert Cliffs Nuclear Power
)
r Plant Unit Hos. 1 and 2)
)
)
EXEMPTION i
I.
The Baltimore Gas and Electric Company (the licensee) is the holder of Facility Operating License Nos. DPR-53 and DPR-69 which authorize operation of the Calvert Cliffs Nuclear Power Plant, Unit Nos.1 and 2.
These licenses provide, among other things, that they'are subject to all rules, regulations and Orders of the Comission now or hereafter in effect.
-The facility comprises two pressurized water reactors at the licensee's
' site located in Calvert County, Maryland.
II.
On November 19, 1980, the Commission published a revised Section 10 CFR L50.48 and a new Appendix R to 10 CFR 50 regarding fire protection features of
- nuclear power plants (45 FR 76602)._ The revised Section 50.48 and Appendix R became.ef fective on February 17, 1981.- Appendix R,Section III.G.2.a. re-quires that cables, equipment, and associated circuits of redundant systems and components important to safe shutdown be separated by 3-hour rated fire barriers.
- By letter dated November 21, 1983, the licensee requested an exemption from.Section-iil.r.ofAppendix.Rto10CFR50totheextentthatitrequires approved fire' c~oor assemblies for the protection of personnel access openings i.
8404090081 840315-fDRADOCK. 05000317 PDR
4 'in 3-hour rated fire boundaries. As an. alternative, the licensee has pro-posed the use of non-rated watertight doors and water curtains in specified
. plant areas.
'The Unit 1 and Unit 2 service water pump roons are located on the 5 foot elevation-of = the auxiliary building and are separated by greater than 400 -
feet.
The watertight door in each pump room provides access to the adjacent penetration rooms, thus permitting a path for fire to spread from one service water. pump room through the two adjacent penetration rooms to the second service water pump room.
4 By letter dated March 19, 1981, the licensee requested an exemption for similarly designed watertight doors. ' This exemption was granted on August 16,
'1982 based upon our evaluation of test data which indicated that these water-tight doors would perform adequately as three-hour rated fire, doors (the
'ASTME-119 test).
- Although the doors referenced in the November 21, 1983 letter are approxi-mately one-half.the size of the doors tested per ASTM E-119, we conclude that'
- the size difference would not appreciably affect the test results.
With regard to the water curtains, the licensee's November 21, 1983. letter proposes installation of a dedicated sprinkler head (water curtain) to provide-three-hour ' protection for an unrated metal emergency. hatch between Corridor
[
~No.:110.(Elev. - 10'-0") and Reactor Co'olant Make-Ilp Pump Room No. 216A' (Unit 2,-Elev. 5'-0").
Ro'om 216A is presently provided with sprinkler pro-
.tection. This sprinkler system will supply a dedicated sprinkler head on.
.the' Room 216A side of the hatch.
0n the Corridor No. 110 side of the hatch, a dedicated sprinkler head will be ' supplied fron.the Room No.116 sprinkler system.
m
,- In an Exemption dated August 6,1982, the staff approved the use of water curtains for specific locations at Calvert Cliffs.
This approval was based upon our evaluation of ASTM E-119 test results which indicated that the proposed fire curtain design provided an equivalent level of fire protection as the required 3-hour rated fire door assemblies, and will pro-
= vide reasonable assurance that a postulated fire will not propagate to re-dundant trains. The hydraulic capacity of the sprinkler systems supplying the dedicated heads referenced in the licensee's November P1, 1983 letter is sufficient to ensure a water curtain density on both sides of the hatch consistent with that used in the ASTM E-119 tests and is therefore adequate.
. Based upon the above, we conclude that the IcVel of fire protection provided by the watertight doors and water curtains is equivalent to the level of protection required by the technical requirements of, Appendix R
~to 10 CFR 50, and-therefore, the licensee's request to be exempted from the requirement to provide' 3-hour fire rated barriers for the areas described in Attachment 1, herein, should be granted.
An Exemption has also been requested from Section III.G of Appendix R to the extent it requires the. installation of automatic suppression throuahout a protected area.
~
Fire Area 10 is located on the minus 10 foot elevation of the auxiliary building and includes a' corridor and a charging pump roon. There are four.
additional. rooms in Fire Area 10 that -contain water processing equipment.
Four rooms do not contain fixed fire suppression (sprinklers).
The remainder
- of' Fire Area 10 is provided with automatic suppression and detection. The
. comb'ustible loading ~ in the_ area is negligible.
4-Fire Area 11 is on the 5 foot through 69 foot elevations of the auxiliary Automatic fire. suppression and detection are provided on the 5 foot building.
elevation; however, the automatic sprinkler system does not extend to the 69 The floor / ceiling assembly between the 45 and 69 foot eleva-foot elevation.
The tions is a 3-hour rated barrier except for a rolling steel fire door.
. door is approved as a 3-hour rated barrier when installed vertically, but as The installed in the floor, its fire resistance capability is uncertain.
The combustible loading ceiling height in both areas is greater than 20 feet.
Cables for the diesel generators are located on the 45 foot
-is negligible.
elevation at the ceiling level; however, they are located greater than 20 feet above the floor and are adequately protected by autenatic sprinklers.
Redundant cables are located in a corridor on the 69 foot elevation behind The corridor construction the spent fuel pools approximately 40 feet away.
is unrated.
Fire Areas 10 and'll consist of large areas containing negligible amounts of ~ combustible materials. Sprinklers are provided in po'rtions of the areas where minor quantities of conbustibles exist. Detection.systens are pro-If a fire occurred in a non-sprinklered portion vided-throughout the areas.
of either area,L the early warning provided would alert the fire brigade.
~
The'confiouration of the areas conbined with the response of the fire brigade would prevent a fire from growing to a size which would overwheln the partial The addition of nore sprinkler coverage would not signi-sprinkler systems.
ficantly enhance safety.
--Based on ourf evaluation, we conclude' that the protection provided for the -
Fire Areas '10 -and 11 provide a: level of-fire protection couivalent to the~ tech-
.nical requirenents of Section III.G. The exenption should, therefore be granted.
. With regard to RCP oil collection, the licensee has requested an exemp-tion from Appendix R Section III.0 to the extent that it requires an oil collection' tank sized to hold the lube oil inventory of all four RCP motors.
Each Calvert: Cliffs reactor coolant system has four reactor coolant pumps, with an oil collection system which drains to two vented closed collec-tion tanks (two pumps per tank). The quantity of lubricating oil in each pump is 225 gallons. The capacity of each oil collection tank is 275 gallons. The components, except for the collection tanks, have been designed so that they are capable of withstanding a safe shutdown earthquake (SSE). The collection
. tanks are arranged such that, if a failure of more than one RCP motor lube systen occurred, the: oil collection tank would overflow onto the lower con-tainment floor.
The lubricating oil used in the RCP motors has a flash point greater than 400 F.
There are no ignition sources at the flopr level of the low ~er containment.
The RCP motor lube oil system'does not comply with Section III.0 because the oil collection tank is not sized to contain the entire lube oil system
- inventory. _The RCP motor lube oil systen is capable of withstanding the safeL shutdown earthquake. The oil collection tank is provided with suffi-cient-capacity to hold the total lube oil inventory of one reactor coolant pump with nargin and is designed so that any overflow will he drained to
~
> a safe location. This combinationlof features is acceptable.
Based'on the above, the existing RCP motor luhe oil collection systen provides a level of safety equivalent 'to the technical requirements of Section III.0 and, therefore, the exemption _should be granted.
-a
.. III.
Accordingly, the Commission has determined that, pursuant to 10 CFR 50.12,
- an exemption is authorized by law and will not endanger life or property or the.comon defense and security and is otherwise in the public interest and hereby grants the following exenptions with respect to the requirenents of. Appendix R to 10 CFR Part 50:
Section III.G
" Fire protection of safe shutdown capability" (1) The licensee may utilize the proposed alternatives to the requirement for maintenance of 3-hour fire rated barriers.
The proposed alternatives.and locations of their use are contained in Attachment I-hereto.
(2) The licensee need not install fixed fire suppression systens in Fire Areas 10 and 11 in addition to that described in the the licensee's November 21, 1983 submittal.
Section III.0 "011 collection systen for reactor coolant punp" The existing oil collection. tank capacity for Calvert Cliffs Units
~1 and 2 is adequate.
The NRC staff has determined that the granting of this Exenption will not
. result in.any. significant environmental inpact and -that pursuant to 10 CFR 51.5(d)(4) an environmental impact statement or negative declaration and
' environmental inpact appraisal need.not he' prepared in connection with this action.
OR THE NtlCLEAR REGtlLATORY COMMISSION kl0 &, k k u} t Darrrell G./ isenhut, Directo
. Division of_ Licensing
' Office of Nuclear Reactor Regulation i.
10ated at Bethesda, Maryland
_this 15th day of March,- 1984.
Attachment:
1; Alternative Fire Barriers Calvert Cliffs Units 1 and 2 l
e
s.
ATTACHMENT 1 CALVERT CLIFFS UNITS 1 AND 2 ALTERNATIVE FIRE BARRIERS Unit No.
Door No.
Between Rooms Type 1
Emergency Hatch 3 226 & 227 Watertight 2
Emergency Hatch 4 205 & 206 Watertight 2
Escape Hatch 216A & 110 Water curtain f
y t
UNITED STATES p ** "'8 NUCLEAR RE ULATORY COMMISSION
+
DISTRIBUTION:
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WASHINGTON, D.C. 2 cess r,
- 8 LDocket File g%,,,,,
ORB #3 Rdg PMKreutzer DOCKET No.
50-317 50-318 MEMORANDUM FOR:
Docketing and Service Branch Office of the Secreta'ry of the Commission FROM:
_ Office of Nuclear Re'act'or Regulation
SUBJECT:
BALTIMORE GAS'AND ELECTRIC COMPANY Calvert Cliffs Nuclear Power Plant Unit Nos. I and 2 One signed orig:nal of the FederalRegister Noticeldentified below is enclosed for your transmittal to the Office of the Federal Register for publication. Additional conformed copies (
6 ) of the Notice are enclosed for your use.
C Notice of Receipt of Application for Construction Permit (s) and Operating License (s).
C Notice of Receipt of Partial Application for Construction Permit (s) and Facility License (s): Time for Submission of Views on Antitrust Matters.
C Notice of Consideration of Issuance of Amendment to Facility Operating License.
Notice of Receipt of Application for Facility License (s); Notice of Availability of Applicant's Environmental Report;and Notice of Consideration of issuance of Facility License (s) and Notice of Opportunity for Hearing.
C Notice of Availability of NRC Draft / Final Environmental Statement.
C Notice of Limited Work Authorization.
Notice of Availability of Safety Evaluation Report.
Notice of issuance of Construction Permit (s).
C Notice of issuance of Facility Operating License (s) or Amendment (s).
- Order, h Exemption.
Notice of Granting of Relief. -
L Other:
Division of Licensing Office of Nuclear Reactor Regulation
Enclosure:
As stated
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PM.W, (,,ujzerhn.,,,
- ,,s ) 3/ /84 OFFICIAL RECORD COPY g