ML19289E750
| ML19289E750 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck, Millstone File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/18/1979 |
| From: | Counsil W NORTHEAST UTILITIES |
| To: | Reid R, Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7905290073 | |
| Download: ML19289E750 (16) | |
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J T"' T,,,, ',1, J.' ' l' May 18, 1979 Docket Nos. 50-213 50-245 50-336 Director of Nuclear Reactor Regulation Attn: Mr. D. L. Ziemann, Chief Operating Reactors Branch #2 Mr. R. Reid, Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C.
20555
Reference:
(1)
W. G. Counsil letter to D. L. Ziemann and R. Reid dated April 11, 1979.
Gentlemen:
Haddam Neck Plant Millstone Nuclear Power Station, Unit Nos.1 and 2 Fire Protection Modifications In Reference (1), Connecticut Yankee Atomic Power Company (CYAPCO) and Northeast Nuclear Energy Company (NNECO) provided a synopsis of the fire protection modifi-cations for which additional information was requested for the Haddam Neck Plant, Millstone Unit No.1, and Millstone Unit No. 2.
Since the date of Reference (1), our respective Staf fs have discussed the modifi-cations, and additional questions have resulted.
In response to these verbal Staf f concerns, Attachment 1 is provided.
It is noted that in fulfillment of the existing license conditions for each of the three plants, engineering and design for most of these modifications is in progress.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY NORTHEAST NUCLEAR ENERGY COMPANY
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$20 Attachment 79052 900~/ 3
- DOCKET NOS. 50-213 50-245 5 0.' ' 6, ATTACIMENT 1 IIADDAM NECK PLANT MILLSTONE NUCLEAR POWER STATION, UNIT NOS 1 AND 2 FIRE PROTECTION MODIFICATIONS 2046 521 MAY, 1979
SUPPLEMENTAL NRC FIRE PROTECTION QUESTIONS FOR CYAPCO 1.
Yard Loop Sectionalizing Modification NRC Concern:
(a)
If the shorter loop of the underground fire water main were out of service (Point #1 to Point #2, see SK-CY-1A) then what would be the pressure drop to supply water from Point #3 to Point #4 using that portion of the underground main which remains operational.
Response
The approximate length of underground fire water piping from Point #3 to Point #4, assuming main is out of service from short leg Point #1 to Point #2, is 1500 feet.
The pressure drop for 1500 feet of 12" fire water piping is about 15 pounds.
If the shorter leg were operational, five pounds of pressure drop would be lost to supply to Point #4.
Therefore, the additional pressure using the longest water routing is actually ten pounds.
The additional ten pounds loss of pressure at Point #4 does not affect the water demand of water suppression systems connected to the service building fire water manifold.
NRC Concern:
How is the cross-tie from the service building fire vtater manifold connected to the exsting 4" turbine building hose station ring header.
Response
Note on the attacked sketch (SK-CY-1B), the 4" cross-connection originates at th
" fire water manifold in the service building and cor,
- ts into the existing turbine building hose station ring header as shown.
2.
Diesel Fire Pump Sprinkler System NRC Concern.
Existing sprinkler design for the diesel fire pump has only two (2) sprinkler heads.
NRC recommends four (4) sprinkler heads for better coverage.
Response
Design will be revised to incorporate the two (2) additional heads.
l00 D b
SUPPLEMENTAL NRC FIRE PROTECTION QUESTIONS FOR CYAPCO 3.
Halon Suppression System for Switchgear Room NRC Concern:
Is the Halon suppression system discharged directly into the applicable cabinets?
Response
Yes, the Halon suppression system is designed to discharge directly into MCC-5 480 volt switchgear, DC distribution panel and the inverters as noted on SK-CY-G.
4.
CO2 System for Containment Cable Vault NRC Concern:
Will there be a dealyed discharge alarm when the CO2 system is modified to automatic mode?
Response
Yes, a delayed discharge alarm will be incorporated.
5.
Reactor Containment / Reactor Coolant Pump Detection Systems NRC Concern:
(a)
Detection head lo:ations and installation shall be in accordance with NEDA-72E and 72D, respectively.
(b)
Detection for RCP's should be ultraviolet or smoke sensing type but not b. eat rate of rise / fixed temperature as proposed.
(c)
Detection systems to be installed should be compatible to existing systems / equipment (high/ low voltage).
(d)
What is detection system Lackup capability (emergency power or battery)?
Response
NFPA 72E details the selection, location, spacing and acceptance testing of commercial type detection systems.
The code is not specific enough to be useful for an application such as detec-tion inside containment.
Applicable sections of NFPA 72E will be used for guidance in the engineering and design of detection systems to be installed.
z046 523 e
SUPPLE!! ENTAL NRC FIRE PROTECTION QUESTIONS FOR CYApCO NFPA 72D provides guidelines for installation of detection systems.
Full compliance to this standard is also impractical for our specific application.
The fire detection signalling system to be installed is a hardwired, Class B, supervised system.
It will have the facilities for testing, circuit supervision, visual and audible alarming that complies with the general intent of NFpA 72D.
The main reason for using heat rate of rise / fixed temperature detectors for the reactor coolant pump areas is that they are not affected by the adverse environment conditions inside the 0
loop area of containment.
This environment (120 F and 1.5 to 30 re9/hr) could affect the sensitivity of delicate electrical components of photoelectric type smoke detectors, ionization type, or even ultraviolet detectors.
Detectors to be installed will be sufficient in number and strategically located to satu-rate the RCp area and improve on response time.
Also, the location of the actual detectors is normally inaccessible during unit operation and the high reliability of the proposed heat detectors was a deciding factor.
At CYApCO, the existing smoke / ionization type detection systeras are of the high voltage type (220 VDC).
New detection equip-ment to be installed wil? be of the low voltage type (24 VDC).
The low voltage system offers new/ modern features and has many advantages over the high voltage system.
The high and low voltage systems are linked together by dry sets of contacts thus assuring compatibility.
These contacts are used for " trouble" and " fire alarm" indications.
The detection system at Connecticut Yankee will have battery back-up power supplies which are sized for a 24-hour primary power interruption.
The primary power supplies are derived from the nonvital lighting power supply.
2046 324
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SUPPLEMENTAL NRC FIRE PROTECTION QUESTIONS NNECO - MILLSTONE UNIT NO. 1 1.
MOTOR GENERATOR SETS, CURBED AREA SPRINKLER SYSTEM NRC Concern (a)
What is the water density for this system?
Response
Water density for the sprinkler system providing protection to t:1e curbed area of the MG-sets is.30 gpm per square foot of effective water curtain protection.
2.
SPRINKLER SYSTEM FOR CONDENSATE BOOSTER PUMPS AND REACTOR FEEDWATER PUMPS NRC Concerns (a)
What water density is being provided for each pump?
(b)
What type of sprinkler / spray nozzles are being used?
(c)
Will heat collectors be provided?
(d)
Because sprinkler / spray nozzles are exposed to mechanical damage, will mechanical shielding be provided?
Response
Water density is.30 gpm per square foot of oil collection curbed area.
Standard fusible link pendent type sprinkler nozzles will be used with mechanical shielding (screen) and heat collectors.
3.
WATER CURTAIN SPRINKLER PROTECTION FOR ZONE T-9 NRC Concern (a)
NRC requested a specially designed hood or heat and water collector with standard fusible link pendent heads.
Response
A standard or typical water curtain will be provided for the openings agreed upon.
Standard fusible link pendent heads will be utilized.
2046
$28
SUPPLEMENTAL NRC FIRE PROTECTION QUESTIONS NNECO - MILLSTONE UNIT NO. 1 4.
REACTOR BUILDING (ELEVATION 14 '6") SPRINKLER SYSTEM AND TURBINE BUILDING MEZZANINE AREA SPRINKLER SYSTEM NRC Concern (a)
Define the proposed sprinkler systems in terms of water density, method of application, and type of sprinkler / spray heads used.
(b)
Define the closest independent water source that will supply the sprinkler system for R-2A and R-2B.
Response
The use of wet pipe sprinkler systems to provide protection for cable tray concentrations, is not clearly defined.
Regulatory agencies, such as NRC, ANI, and NFPA, have no definite guidelines or design parameters for the referenced application.
NUSCO Engineering's fire protection concept for cable tray concen-trations using a wet pipe sprinkler system is as follows (refer to attached sketch):
(1)
Branch lines will extend up and down vertically from ceiling elevation feed lines.
(2)
Branch lines will route sprinkler heads directly into the space between cable trays.
(3)
Sprinkler heads located between trays will discharge water directly over and parallel with the trays.
(4)
Horizontal spacing of branch lines will be dependent on extent of coverage provided by sprinkler heads used.
(5)
Type of sprinkler head to be provided has not been determined.
Type of sprinkler head desired is one that will provide the best coverage for this parallel protection concept.
(G)
Minimum water density for this type of sprinkler system is
.15 gpm per square foot of cable surface area (actual water density raay well exceed this value af ter engineering and design 's completed.
This scheme is the typical concept to be utilized throughout the cable conc (ntration areas.
Individual installations will be dictated by actual >lant arrangement, however, any modifications will be consistent with this concept.
2046 529
SUPPLE)! ENTAL NRC FIRE PROTECTION QUESTIONS NNECO - MILLSTONE UNIT NO. 1 Fire water supply for the sprinkler system protecting zones R-2A and R-2B is provided from two (2) mutually independent sources.
The attached drawings show the supply from the reactor building ring header and the turbine building ring header.
Iso-lat ion of either lieader does not prevent supply from the other source.
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SUPPLEMENTAL NRC FIRE PROTECTION QUESTIONS NNECO-MILLSTONE UNIT NO. 2 1.
RAILROAD AND TRUCK ACCESS SPRINKLER SYSTEM NRC Concern (a)
NRC requested that sprinkler system to be installed in fire zone A-27B should be extended into fire zone A-27D.
(b)
NRC expressed concern with method of providing water pro-tection to fire zone A-27B.
Their concern is that three (3) sprinkler systems are utilizing the same water flow alarm mechanism.
Response
The sprinkler systeni to be installed in fire zone A-27B will be extended approximately fifteen feet (15') into fire zone A-27D to provide protectiot for cable tray concentration.
The sprinkler system for the Railroad Access Area (fire zone A-27B) will be piped to utilize existing OS&Y shutoff valve and water flow alarm.
The exis;ing valve and flow alarm also handles fire zone A-30 and fire zote A-45.
These zones are relatively close to each other and no significant time is lost during fire brigade response.
2.
REACTOR CONTAINMENT / REACTOR COOLANT PUMP DETECTION SYSTEMS NRC Ccncern (a)
Detection head locations and installation shall be in accordance with NFPA-72E and 72-D respectively.
(b)
Detection for RCP's shoulo be ultraviolet or smoke sensing type but not heat rate of rise / fixed temperature as proposed.
(c)
Detection systems to be installed should be compatible to existing systems / equipment (high/ low voltage).
(d)
What is detection system backup capability (emergency power or battery).
Response
NFPA 72E details the selection, location, spacing, and acceptance testing of commerical type detection systems.
This code is not specific enough to be useful for an application such as detection inside containment.
Applicable sections of NFPA 72E will be used for guidance in the engineering and design of detection systems to be installed.
2046
$34
SUPFLEMENTAL NRC FIRE PROTECTION QUESTIONS '
NNECO-MILLSTONE UNIT NO.2 NFPA 72D provides guidelines for installation of detection systems.
Full complian]e to this standard is also impractical for our specific application.
The fire detection signn3'ing system to be installed is a hardwired, Class B, s'1 ' e r v.$ sr d c
system.
It will have the facilities for testing, circuit super-vision, visual and audible alarming that complies with the genera 2 intent of NFPA 72D.
The main reason for using heat rate of rise / fixed temperature detectors for the reactor coolant pump areas is that they are not affected by the adverse environmental conditions inside the loop area of containment.
This environment (120 F cnd 1.5 to 30 rem /hr) could affect the sensitivity of delicate electrical components of photo-electric type smoke detectors, ionization type, or even ultra-violet detectors.
Detectors to be installe'd will be sufficient in number and strategically located to sach-rate the RCP area and improve on response time.
Also, the loal-
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tion of the actual detectors is normally inaccessible during plant operation and the high reliability of the proposed heat detectors is a major factor.
With respect to compatibility of detection systems, Millstone Unit No. 2 systems to be installed are of the same type and make as the existing high voltage system.
Backup capability of Millstone Unit No. 2 detection systems is provided by the diesel 15G-13U-2 in cases of loss of no;- 1 power.
2046 535
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