05000456/FIN-2009006-02
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Finding | |
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| Title | Diesel Oil Storage Tank Room Sprinkler Obstructions |
| Description | An Unresolved Item (URI) concerning obstructions for the foam-water sprinkler system installed in the 2B diesel oil storage tank room was identified. The inspectors identified significant obstructions to sprinkler discharge in the 2B diesel oil storage tank room. Two of the sprinklers were each located between two parallel ventilation ducts in the west portion of the room. The ventilation ducts were located approximately 39 inches apart where one of the sprinklers was located and 21 inches apart where the second sprinkler was located. The inspectors noted that the discharge from both sprinklers would be significantly obstructed by the ventilation ducts in two directions. In addition, one sprinkler, located in the northeast corner of the room, was located within a few inches of a ventilation duct thereby resulting in significantly obstructed discharge in one direction. All three sprinklers discussed above were less than one foot away from a ventilation duct with the deflectors located several inches above the bottom of the ventilation ducts. Also, a 60 75 inch platform was located in the northwest corner of the room which substantially obstructed discharge from sprinklers. No sprinkler was located underneath the platform. The sprinkler system installed in the 2B diesel oil storage tank room was a foam-sprinkler system, which was required to meet the specifications of NFPA 16-1980, Standard for the Installation of Deluge Foam-Water Sprinkler Systems and Foam-Water Spray Systems. Section 4.2.1 of NFPA 16-1980 specified that foam-water sprinkler systems and foam-water spray systems conform to all applicable requirements listed NFPA standards except where otherwise specified. Section 4.2.1 of NFPA 16-1980 listed NFPA 13, Sprinkler Systems, as one of the listed standards. Chapter 4 of the Fire Protection Report indicated that the licensee was committed to NFPA 13-1985 and NFPA 16-1980 for Braidwood. Section 4-2.4.6 of NFPA 13-1985 specified that deflectors of sprinklers in bays shall be at sufficient distances from the beams, as shown in NFPA 13-1985 Table 4-2.4.6 and NFPA 13-1985 Figure 4-2.4.6, to avoid obstruction to the sprinkler discharge pattern. NFPA 13-1985 Table 4-2.4.6 specified a maximum allowable distance of zero inches for deflectors for sprinklers having a distance of less than one foot from beams. The configuration of the three sprinklers discussed above was similar to that of the beams discussed in Section 4-2.4.6 of NFPA 13-1985, in that the ventilation ducts provided obstructions similar to structural beams. In addition, Section 4-4.11 of NFPA 13-1985 specified that to provide sprinklers underneath decks and galleries over four feet wide. The inspectors and the licensee mutually agreed that it would be beneficial to seek a formal code interpretation from NFPA to resolve the issue. The licensee agreed to seek a formal NFPA interpretation of the following questions: Question 1: Is it the intent of Section 7.3.1 of NFPA 16-2007 that applicable requirements from referenced standards be specifically identified as mandatory text within NFPA 16-2007? Question 2: If the response to Question 1 is No, then is it the intent of Section 7.3.1 of NFPA 16-2007 to invoke as a mandatory requirement all of the obstruction criteria described in NFPA 13-2007 specifically, NFPA 13-2007 Sections 8.5.5 and 8.6.5? The inspectors noted that it was necessary to pose the question to NFPA based on current code requirements instead of the licensees code of record as NFPA normally does not provide interpretations on historical codes. In addition, it was necessary to pose the questions in a form which could be answered yes or no. The issue will be tracked as an Unresolved Item pending a formal interpretation from NFPA. (URI 05000256/2009006- 02;05000257/2009006-02 |
| Site: | Braidwood  |
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| Report | IR 05000456/2009006 Section 1R05 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | N Shah R Langstaff J Robbins B Dickson M Perry A Garmoe R Skokowski C Scottm Munirr Daley R Langstaff R Winter L Jones |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2009006 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2009Q1
Self-Identified List (Braidwood)
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