NRC Addendum/Addenda No.: 3 Project No. M50-5046 Mechanical Drawing: 5046-M03: Schedule: Piloted Operated Steam Pressure Relief Valve (SRV) Change: Piloted Operated Steam Pressure Relief Valve (SRV) To: Steam Pressure Relief Valve (SRV) Capacity at set pressure: Change: 24,419 lb/hr To: 38,283 lb/hr Orifice Size: Change: 6.692 in^2 To: 11.50 in^2 Body Material: Change: Cast Iron To: Carbon Steel Option to be included: Change: External Lift Leaver To: Field Test Connections Change: Exposed Spring To: Modulating Add: Teflon Seat, Factory Mounted Pilot Page 1 of 3 Standard of Acceptance: Change: APOLLO, SERIES 119, - ASME SECTIONS VIII To: Farris, Series 3800 (Model: 384T10) Add Note: Selection of SRV is based on a total Cv of 4.37 per PRV. Changes to SRV size and related piping as required to suit alternate PRV selection shall be at contractor’s cost. Provide drain pad to suit SRV. NRC Addendum/Addenda No.: 3 Project No. M50-5046 Page 2 of 3 Schedule: Steam Pressure Reducing Control Valve Main Body Add: Rangeability: 50:1 Sound Output: Maximum sound rating: 91 dB(A) at 7,500 lb/hr and 100 psig inlet and 50 psig outlet. Air Regulator/Filter Add: To be complete with inlet and outlet factory mounted pressure gauge. Notes: Add: Gauge transmitter: Accuracy +/- 0.075%, Stability: +/- 0.1% of URL for 3 years, Process connection: ½” NPT, Output: 4 to 20mA dc with HART Protocol, C/W Calibration certificate (5 points), Adjustable range : -14.7 to 800 psi Schedule: Pressure Gauges (PG-#): PG-1 to 3 Case Material: Change: T.P To: S.T Dial Size: Change: 115mm To: 100mm Maximum System Pressure (oC) Change: 150 To: 93 Delete: Maximum Short Term Temp. (oC) Change: Connection (F-NPT) To: Connection (NPT) PG-1 Gauge Dual Scales: PSIG (kPa) Change: 0-125 To: 0-160 PG-1 and 3 Gauge Dual Scales: PSIG (kPa) Change: 0-125 To: 0-160 PG-2 Gauge Dual Scales: PSIG (kPa) Change: 0-100 To: 0-60 NRC Project No. M50-5046 Addendum/Addenda No.: 3 Page 3 of 3 Specifications: Section 21 07 19: Thermal Insulation For Piping Article 3.5.3 Change: Thickness of insulation as listed in following table. To: Thickness of insulation listed below. Article 3.5.3.2.1 Change: Inside Building: 75mm To: Inside Building: 75mm (Two 37.5mm thick layers) General: Acceptable Alternates: Steam Control Valve: Spirax Sarco Steam Traps: Armstrong Steam Pressure Relief Valve (SRV): Spirax Sarco, Apollo and Consolidated Strainers: Armstrong Note: It is the contractor’s responsibility to ensure that all material and equipment meets and/or exceeds the requirements of the specifications. Final acceptance or rejection of all equipment and material will occur during shop drawing review.